Crysis would be a great shooter.
If it weren't the buggiest piece of shit I've ever tried to run. Settings don't seem to matter. Display drivers don't matter. I even installed the RC1 beta Vista SP.
First it wouldn't read the disk.
Then it would crash trying to load saves.
Then it would shut off my mouse and keyboard.
Then objective updating completely bugged out.
DirectX 9 or 10, it doesn't matter. Low, High, Very High settings, it doesn't matter. I even turned on single processor affinity, which seemed to help things until it triggered a huge memory leak.
This thing is a buggy piece of shit on a computer pretty much designed to run a game of its kind: Core 2 duo, dual 8800s, 4 gigs of RAM.
When it runs, it looks great and runs fast. The gameplay is a sleeker iteration of Far Cry, which is also a blast. It's not quite a sandbox game, but you have a larger array of tactical options available at any one time.
But it has more major bugs than I've encountered in any game, ever. They might patch it soon, but I'm likely to uninstall it in the meantime.
*Sigh* Back to The Witcher, I suppose. Which is a post for another time.