Every environment (not just the dungeons) was recycled about 5 times, including the city itself.
It was SOOOOOOOOOOOOOOOO easy, compared to the manning-up difficulty (at least a decent level of challenge that DA:O gave you even on lower difficulty levels) that the original brought along.
Every character besides Fenris, Isabella and Varric were unlikeable wastes of development time. Even your siblings were talkings pieces of flesh with no purpose other than to die or dissapear for the 95% of the rest of the game.
these are my direct complaints about the other characters:
Anders: unlikeable, annoying and ungrateful douchebag through and through. Wish i could´ve killed him earlier.
Aveline: Stereotypical business lady who has shyed away from love-life because of her dead husband.
Siblings: see above.
Sebastian: He had absolutely zero purpose for the story. his rivalry/loyalty thingy was messed up/buggy (he would gain rivalry when you agreed with him), and his skillset was dreadful.
Merrill: unlike Leliana, who was likeable and naïve, Merrill is downright mentally challenged, had a skillset worse than Sebastian´s, and was just plain annoying as shit.
Hawke him/herself wasn´t especially likeable, being a terrible mix of Witty, helpful and douchebag mixed up.
Plot twists were few and far between, and when they appeared they were poorly written and predictable.
ending was a cliffhanger, although a less retarded one than most, it still bugged the hell out of me.
Act 3 was not only broken (entire side questline that didnt work for 2 months), but extremely poorly written (Im talking Witcher 1 DLC awful), and the main plotline left much to be desired.
Boss fights were unentertaining as all hell (Arishok was just chucking potions and running in circles, Meredith the NPC´s did all the work for you, Orsino was a chore and they re-used the dragon bosses from DA:O way too much).
New Gift system kind of sucked.
No proper exploring (no interesting hidden items, as you got pretty much all the best gear by just following the storyline).
i could go on, but i think you get my drift. Bioware even admitted several times that they lazied alot on the project and cut out alot of features.