RPG is such a broad genre with so many distinct styles, so many sub genres.
For SRPGs I would have to say X-Com even tho the RPG aspects of the game are not the focus they perfectly complement the other aspects of the gameplay. Character development really helps build attachment to the members of your squad, and the rest of the game is so great as well atmospheric, and haunting battlescape, multi layered strategic gameplay. It is a true classic.
For ARPGs I would have to say The Witcher 2 is the best I have played, from it's great characters and storytelling to it's gritty world with true shades of grey moral choices and some rewarding and complex combat. It looks fantastic as well, and the post launch support is nothing short of fantastic.
for the turn based Japanese RPGs I would have to say that Riviera: The promised land, was a fantastic experience with interesting combat mechanics and a quirky story with lovable characters and some great design work.
Also a special mention for Castlevania: Symphony of the Night, which in many ways it was the perfect metroidvania, combining exploration, great enemy design and some great WTF moments.
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