Looks amazing, like a whole new game with all new characters. The only DLC I've played was for Bloodborne, so I'm not familiar with FS's approach, but if Old Hunters is any indication, this is going to be so good!
I've played the 3 dark souls (too much) and bloodborne. My opinion is that all of the DLCs added a lot to the game. Also a lot more difficulty, which I'm looking forward to in Elden Ring. I want a Midir-tier boss for Elden Ring. Although that is a DS3 spoiler (if you look into it), so don't look it up if you want to remain untarnished.
Both of DS3s DLCs were really good but I thought that The Ringed City was pretty hard, maybe a little too hard. Ashes of Ariendel is great and Friede is one of the all time best bosses.
Midir was definitely slightly too hard. Still have yet to beat it alone. Friede was really annoying, but really rewarding at the same time. Overall great fight.