Without going back to older games, currently it's Skate. without a shadow of a doubt.
Such realism, fluidity and a wonderful sense of accomplishment when you nail that line you've been working on.
Sure it's missing a few moves, and there's some tricks out there that really should be in the game (inverts/handplants etc...), but it is really brilliant and very easy to look past these very insignificant things that are missing from an otherwise fabulous game.