Racers and fighters running at 60fps is a must, and I have a feeling that when these games are reviewed and compared, reviewers will prefer and appreciate the 60fps and less blurred visuals (30fps is commonly accompanied by motion blur to reduce judder) and will give the nod to the smoother game.
Huh? If motion blur is done right then you shouldn't even notice that it's there. It should blend in so well that it looks completely natural to the game. And even when it isn't done right it doesn't cause the game to become blurry. Whenever a game is blurry it's usually a result of a game running in sub-HD or having a poor form of AA implemented (like QAA).