Mirror's Edge is good for a rental, at least. Not really a shooter, but it seems to have trouble deciding WHAT it is.
Devil May Cry 4 is loads of fun after you get past the insanely long install process.
Gran Turismo 5: Prologue is flat out one of the best (and most frustrating) racing games I have ever played. I'm just hoping when the final version of GT5 comes out, they cut Prologue owners a break on the price.
Little Big Planet....get it. That's all that needs to be said
White Knight Chronicles...they need to hurry up and release the damned thing already
PAIN. Mindless fun, cheap, entertaining.
Sure, DMC and ME are both on 360 as well, but they're still worth playing. Overall, I bought mine for bluray. Found out later that it also makes a fantastic media center (TVersity, FTW). First thing to do (unless you got the 160gb model) is upgrade the HDD. As cheap as notebook drives are these days, there's no reason not to cram as much storage in there as you can (especially if you're going to use it as a media center and download lots of demos/movies).