At Gamestop the game is $29.99 new and $26.99 used. I've heard mostly negative about it. One dude said "it sucks" and someone else said that the game itself is not bad but the controls suck? Thoughts? Comments?

There are plenty of better games to get. The controls are fairly unreliable and the game itself is very short. It has an interesting concept, but the gameplay just isn't there. If your looking for a good FPS, I would look elsewhere, honestly.
I have heard a lot of good things about the new Metal of Honor game coming out for Wii. Supposedly it has even better controls than Metroid Prime 3, and a 32 player online mode.