Easily the best FPS multiplayer ever made.. with great optimization.
The graphics are unreal, let's get that out of the way. It also doesn't need 2x 580s to get the job done either!! I'll list my specs below.
The sound is where it's at. WOW. Everything. Sounds. Awesome.
Customization is also HUGE and fulfilling. Personalize jets, tanks or yourself with a good variety of options.
Air combat can be difficult at first, but stick with it. It's worth it.
My rig handles this game with everything on HIGH setting including 1080p, SSAO, 4xAA, and x16AF with 40-60 fps ALWAYS silky smooth.
Phenom II x4 925 @ 2.8ghz ($100)
4 GB Ram ($75)
XFX Radeon 5870 1G ($225)
This gets the job done with frames to spare.
Bottom Line: This is one of the best, well-rounded, and most accomplished games in history.