If anything the only bad one was IWD 2 which made some improvements over IWD (more dialogue, some interesting quests, more voice overs) but was a bit tedious and had poor pacing (come on who put a puzzle-y Ice Palace in my dungeon crawler?).
And to be fair, by then the Infinity Engine just failed to impress after Morrowind and Dungeon Siege (looked pretty at the time, still sucked). And it wasn't so much looks either, it was still gorgeous 2D, but there were no surprises, same basic mechanics as previous games (at least Planescape mixed it up quite a bit).