I loved it, personally! David Tennant and Catherine Tate felt like they'd been away for a month or two rather than 15 years, and it's so nice for Doctor Who to just be fun and funny again.
I know some people didn't like the "let it go" resolution, but also that's just Russell T. Davies I think. You get utterly bonkers ideas (Beep The Meep on primetime TV as a big comeback monster!) a political point of view that he's not afraid to completely smash you over the head with, and an out-of-nowhere hand-wavy resolution that fixes everything (remember when the Doctor became flying space Jesus and then they erased the human race getting genocided back in the day?)
Also I loved the conversation in the cab:
"How's Nerys?"
"She's fine."
"Since the accident?"
"She's not fine."
"It was her fault."
"She's been fined."
ALSO I really like the new TARDIS interior. Someone on another site described Tennant running around it as like a dog with the zoomies lol.
Oh yeah I didn't mean that as a dig at the inclusivity at all, I loved it. I just meant I really enjoy how much RTD does not fuck around when it comes to making a statement lol.
Also it's a very TARDIS move to have a coffee maker built into the console, and also have the console violently explode on contact with coffee.
The TARDIS knows how Donna was fired, it knows she's a bit clutzy, and it knows she takes subliminal suggestion, especially after being recently demetacrisised. It also misses her and needs her to stay with the Doctor for a while longer. So, predictably, Donna spills her coffee on the console, and the TARDIS is all like WHOOAAAA, oh my, I'm falling, I'm on fire, look at the sparks, we could go anywhere!! Heehee.
Also, I think 14 is the first regeneration since the show came back who didn't immediately blow the TARDIS up upon regenerating, so it had to take care of it by itself!