I don't get the bitching about the UI. I've played far worse. The only significant annoyance I have with it is the fiddliness of looting/interacting with things.
The rest of the jeering is all deserved. Combat is dull, easy, and repetitive, sidequests dull, easy, and repetitive, the choice in party composition is all cosmetic (you need a fighter to bash walls, rogue to unlock doors, and wizard to "energize" things), the pandering is blatant, the writing is mostly bad with occasional islands where it suddenly rises above itself before collapsing back to where it came from, and C&C is just about nonexistent. Yet for some unfathomable reason I'm still enjoying it. Go figure.
To give credit where credit is due, though: the environments are varied and don't look or feel repetitive, the technical execution is excellent, the music is very good, they've put a fair bit of thought anchoring just about everything in the lore, and in places it's highly atmospheric. Also, there's a good deal more variety to the bestiary than before; it's not just endless repetition of three varieties of darkspawn. Oh, and, the romances are much less obnoxious than in any recent BW game I've played; if you don't pick any of the "flirt" conversation options, it's all business.
As usual with BioWare, I'm mostly feeling sad about the missed opportunity. The production values for this thing must've cost a mint. Better writing and better systems would have been a rounding error... and I do not buy that it's not possible to make a game with good writing and systems that's not 'accessible' enough for the mass market.