SSX - plenty of fun, for a week or two. Hiding and collecting geotags adds to the value as a rental. Very reminiscent of the old versions, in a good way.
Max Payne 3 - by Rockstar, really captures the gritty feel of a dark comic, with camera angles, cutaways and freeze frames. the AI actually moves, flanks and attacks. It feels realistic rather than the typical carnival shooting gallery.
Brutally violent, over the top IMO. I love battle games but don't need to see heads and bodies exploding with blood.
Working my way through Assassins Creed Revelations, much like the last one. feels like a halfway house between 2 &3, but I got it for $20 and can trade it in for 16.50, so it is well worth that investment. Amazon still has it for sale for around 20ish.
Ghost Recon Future Soldier is up next as a rental.