Well I'm a big RPG fan and thought it brought a lot of fresh elements to the genre. Yes it was typically overhyped to the max, but then i thought it was a really good title and probably one of the best titles I had played in 2008 - and imo 2008 was a poor year for gaming on the whole.
At first I had doubts, it looked like some kiddie game but I was very surprised. The whole world was superbly created, combat was pathetically easy yes, magic could have been a lot more varied and the game was ridden with typical Molyneux buggyness. I thought the story panned out well too, with a somewhat poor ending.
Not sure about it defining the RPG genre, where did that come from?
The Witcher (coming to the 360 soon) gave us a no holds barred risky approach (sex, racism etc) to the RPG genre as well as bringing a hugely complex game to the fold.
Mass Effect was another RPG bringing new and varied elements into the genre. FPS, RPG, and the ability to punch newscasters.
Fable 2 gave us a bright, vivid world that was different to any RPG I'd ever played. It was just fun and enjoyable throughout, if rather short. It felt like Kameo on crack during some occasions.