Digging inFamous 1, but I'm not that far into it yet. I like how you can't just storm in and punch everyone like a one man army, those Reapers can really hurt. Suckerpunch also got it with the collectibles; whenever I need to go somewhere I always pick up some blast shards along the way.

The karma system though... not too sure. Most of the story missions decisions are more a sense of logic instead of a conscience dilemma. That said, I mostly go with the good. On the other hand though, I once thunder dropped from a building into a group of reapers + pedestrians and my karma dropped like a brick for destroying everything/everyone. Being good has it's shortcomings apparently.