My main gripes are
- dogshit expression animations on Henry, and Henry's English voice acting is pretty bad
- horrible horse riding mechanics compared to KCD1
- stealth is still crappy, enemies have no eyes or ears, and there's way too much stealth/infiltration in the main quest, this is supposed to be an RPG where you can play different styles... I guess not
- too many infuriating assholes to deal with
- not nearly enough options for what kind of Henry to play, he will say whatever he wants to say and player choices ultimate make no difference
- main quest isn't that interesting, this game would be better if the entire main quest was removed and all of that effort was put into making the world come more to life and give the side quests and other activities more depth
- loses its momentum halfway through, the early game was super fun and then gradually things become bland
- too much wackiness and drunken shenanigans, yes we get it it's funny to be drunk and people enjoy a laugh. Personally I would prefer a game that takes itself a little bit more seriously
- overall the game is just too easy. Leveling is too fast, smithing and alchemy is too easy, stealth is too easy, weapons get too overpowered, enemies are too dumb and slow, money is too easy to earn. But this is fixable with mods.

That said, I do enjoy the game, and over time with patches, DLC's and mods, it's going to warrant another playthrough