I've gotten in the rut before as well, it's not a bad thing at all. Still I found the best remedy is to play a completely different kind of game, ones you know you think you might not like even.
I know a lot of people here are fans of Japanese RPGs, so I recommend western style, Try out the New Elderscrolls games, Mass effect, or even some classics like the the first two Fallouts, Baldurs Gate, or Planescape: Torment.
In fact screw the rest and play Planescape: Torment, it is the GODLYIST STORY IN THIS EXISTENCE!