Well, I was playing at 1440xsomething res with high details and it only slowed down 2 times (during in-game cutscenes on the carrier..yeah, it's fully modeled just like the rest of the fleet. Friggin sweet) and I got a GForce 8800 GTX

And yes, it's finger lickin good.
Most of the time you're solo and the suit is brilliant. There are mission where you fight alongside lots of marines and whole tank devision - you drive in humvees, tanks, AAA batteries, trucks, even pilot a VTOL in a canyon dogfight. Wicked.
the aliens are not destroyed. Rather their huge ship they sent to attack the carrier is, but so is the carrier. Another fleet is inbound and it ends there, with you in a VTOL heading back to the island[/quote]