I'm passing on Prototype for now because I figured inFamous would give me the better experience.
Cleared the first island, up to one level before Hero, Champion. It takes forever to gain a Karma level, and I've been especially good, healing anybody that needs it and making sure to always restrain an enemy if I don't accidently kill them first. Storyline is getting a little bonkers, didn't think an explosion could cause this certain groups to go all mental on me, but meh, it happens?
AJ, Cole runs fast enough so you really don't need to worry about lacking high speed movement, but there are faster ways to travel, like grinding on power lines or train rails. Or just riding on top of the train outright. The islands are small enough anyway, so there really isn't anything to worry about.
Plus you know, you can pretty much scale anything. Between the jumping, gliding, and grinding, I'd say there is enough movement to keep the game fun. Speaking of movement, moving around in the game is fun because inFamous manages to keep a tight grip on how things work, yet still make it feel like you're not being locked down, unlike certain games with blue hedgehogs. Actually if there is one thing I've noticed, moving around in inFamous is alot like playing as Knuckles in Sonic Adventure. And thats a good thing.
Anyway, fun game so far.