I have so far played about 6-8 hours of the game on easy because i just like to run around the first time i play a game. I'm at the part where you need to take 5pictures or whatever for the guy in the theater. I've already seen the good ending and know most of the story, from the person that owns the game.
The game is great, i put off playing the game for so long because i saw him play it and it was just not my type of game, but i was so wrong. you can pretty much play the game anyway you want. I put the things on for speed and just run around the levels. All the different types of plasmids add lots of fun to the game.
This is a must buy for any PS3 owner if it comes out for the system. This is in my top 3 for games so far the generation.