Stargate: Universe. I never got into Stargate before, and I really liked what was going on with Universe. Longtime fans didn't. Though, after going back and getting into SG-1 and Atlantis, I very much understand why they hated Universe. The original shit is so much more fun, where Universe was overly serious. I still like the concept, but I think it would have been way better with the campyness of the original shows.
The second is Limitless. It was really fucking good. It was constantly pulling me in. And they cancelled it because too many people found it to be "unrealistic." I'm sorry the show about a neutropic drug that makes you into a super genius isn't real enough for you.
I don't think The Orville was officially cancelled but there doesn't seem to be any plans for more as far as I know. The last season was great and set up more potential storylines.
Stargate universe ended on a cliffhanger, stargate atlantis ended without dealing with the wraith threat or the evil asgard etc. Star trek enterprise's cancellation resulted in one of the worst most hated last episodes in scifi. Quantum leap ended without ever resolving the main plot. Inside job like most of netflix's decent shows, got killed off for stupid reasons.
The movie was pretty superfluously a power fantasy, but the show had actual likeable characters, and long-term intrigue. As far as cop procedurals go, it was way up there.
This is an older one, but The Critic. It was on two different networks and lasted only one season on each network. It was a funny show, but the inconsistent schedule killed it way too early.
“Happy”, I think a lot of people overlooked it because Christopher Meloni having a cartoon unicorn as a companion seemed cheesy, but the show wasn’t afraid to dive into truly horrific plot lines.
The less-grounded corner of my brain thinks the show was cancelled because it was openly talking about skeletons in the closets of network executives.
Star Trek: enterprise. Probably not the best Trek show but it got dropped right when it had found its stride. Also I enjoyed the temporal war arc, which most trek fans seemed to hate. Would have loved to see the stuff they later revealed in interviews that was planned, like archer himself becoming the suliban leader from the future.
Pushing Daisies really deserved another few seasons, but the (previous) writer's strike left it with a really abrupt and unsatisfying end. There wasn't any other show quite like it.
And of course, the perennial winner of such threads, Firefly. At least that got a movie though.
Music videos on MTV
Science shows on discovery channel
History shows on the history channel
Well-produced soft porn on Cinemax
Comedy shows with actual writers and actors
News shows with actual journalism
Constantine. It had it's problems, like many Arrowverse shows at the time, but Matt Ryan was a fantastic John Constantine and I thought the show had a lot of untapped potential.
Not exactly a cancelation, but Star Trek TNG. All of the characters were far more developed than TOS's, which is why they didn't work as well in movies. Better for them to have their own episodes than to unsuccessfully have them share a movie. Any of them could have been just as good, if not better, as multi-part episodes.
Reaper. It was a fun show with a great premise. Basically, a couple sells their sons soul to the devil before he is born. Then on his 21st birthday the devil arrives and informs him he is going to be a bounty hunter for hell. Also, Ray Wise played an awesome devil.
The Dark Crystal: Age of Resistance. I was in awe with this show. Had waited years for it and was not disappointed! I loved the story and the set pieces were absolutely gorgeous. You could tell a lot of love and care was put into it. I was hoping they’d go all the way with this show and that it would end naturally as a full prequel story to The Dark Crystal.
But no. Netflix pulled the plug on Age of Resistance after the first season because it was too expensive. It still stings to this day.
Final Space deserves to be mentioned here. I know there's a wrap up graphic novel slated and I'm super excited to see where Olan goes with Godspeed. But having the whole ip basically wiped off the face of the earth as a tax write off has to be one of the most messed up ways to cancel a show...
I'm glad to see Carnivàle has already been mentioned. If I could choose only one, that is it. There are many others that have been mentioned that are also on my list though.
About the only shows I can think of that I haven't seen mentioned but would also add are Penny Dreadful and Jupiter's Legacy.
This appeals to Hongkongers only, but I miss 頭條新聞 (News Headlines) (I made up this translation)
Despite its name, this was a sarcastic show aired on RTHK, an official government channel. It talks about a lot of events, poor decisions and wrong-doings of the government in a funny way. Unfortunately it was shut down in 2020, by the government.
Our democracy and freedom have been declining since then.
Deadwood. It is still a classic top 5 HBO show, but unfortunately with so much wasted potential and unexplored storylines. I do rewatch it from time to time, but the knowledge of what could have been is kinda detracting from my full enjoyment of it.
Boardwalk Empire. It got more seasons than Deadwood at least, and also had a final episode which kinda wrapped things up, but it was so rushed and contrary to the general pace of the show that it is very jarring to watch.
I didn't really watch shows on Netflix and I couldn't care less about people complaining about their shows being cancelled left and right. But Inside Job was recommended by my friend and I loved it. After finding out it was cancelled after 2 seasons, I finally understood the pain these people were feeling all along...
Stargate Universe. It was Stargate meets Battlestar Galactica and I loved it. It wasn't without its issues, but I felt it was really finding it's feet. Then it ends on a cliffhanger after 2 seasons
The Get Down was such a good show with a fun aesthetic. It was about the birth of hip hop but talked a lot about the politics and culture at the time. It lasted 2 seasons on Netflix and somewhat on a cliffhanger for a few characters, and I wish they got another season or two to fully wrap it up.
The Bastard Son & The Devil Himself. Thought it was very interesting, I loved the magic system and the characters were well developed. It was a really fun journey and the production was such an interesting vibe.
Crusade. The story was just starting to get interesting but JMS had used all of his pull just getting the fifth season of B5 on the air. I'm cautiously optimistic about the animated series that was hinted at by The Road Home but I'm also not holding my breath.
Bonding. First season was ridiculous wrt consent in bdsm but the whole shit was giving hilarious. S2 they tried fixing the consent thing and seemingly forgot to be as funny.
It voluntarily ended but one more season of Seinfeld. They said the show was getting too ridiculous but one more season of ridiculous would've been nice.
What about Brian. Mostly because I think it was the first show that I ever got into that was cancelled without resolving the story. Didn't know that was a thing that could happen.
I don't know the scoop on whether or not it's actually cancelled or if season 6 is in Max/Cartoon Network limbo or what is even going on with it, but I'm saying Summer Camp Island.
I am not okay with this - I was so excited when I watched that seried but then it was announced that it would be cancelled. The only season had a plot twist at the end that the comic didn't have and I was really excited to see where it goes. But Netflix couldn't let that happen.