PS2 vs Xbox vs 360º Article...

[thegreatone0381]

Here's an article I found at 1up.com

http://www.1up.com/do/previewPage?cId=3147757&did=1

Also, we recently learned that the game will feature an auto-adjusting difficulty setting, so if you choose "easy" to start off and then start clearing out enemies left and right, the game will bump up the difficulty to the equivalent of a "normal" setting.

Plus there's a video comparing the 3 as well.