Ghost Rider and God of War: both are beat' em ups using blades on long chains. So they're basically the same game, right?
Main Point: It doesn't matter how similar two games are in terms of style or concept. The main issue is the execution of said concept.
Let's just wait and see how similar these games really are when they actually come out. This type of game pretty much hinges on how intuitive the level editors are. And to me at least, it seems pretty easy to mess up that aspect of the game.
My Top 5:
Shadow of the Colossus, Metal Gear Solid 3, Shenmue, Skies of Arcadia, Chrono Trigger
My 2 nex-gen systems: PS3 
and Wii 
Prediction Aug '08: We see the PSP2 released fall '09. Graphically, it's basically the same as the current system. UMD drive ditched and replaced by 4-8gb on board flash memory. Other upgrades: 2nd analog nub, touchscreen, blutooth, motion sensor. Design: Flip-style or slider. Size: Think Iphone. Cost: $199. Will be profitable on day 1.
