More OT however I personally feel a similar way. The Story (Alot More-so after Act 1) was uneventful, disappointing and cliche/predictable. Only VO's I enjoyed was Leah and Deckard. Dungeon Crawling became hopelessly boring and I'm not a Stat/Gear Obsessed person in any game so that whole aspect was completely lame (In alot of SP RPG's I'll actually take gear that LOOKS better visually then better stats). I play my games in Easy/Normal and have no desire to move into more difficult modes, More interested in the story then the challenge.
So basically in my opinion I generally agree with the OP... Extremely Hyped, mixed feelings initially, then you realise it's complete rubbish. True for Phantom Menace and true for D3 (IMO OFC). However I only did 1 playthrough, maybe 10-12 hours of gameplay instead of getting to 100 and then realising it was crap :S Got for free with AP so whatever >.>