I have been. It's pretty laggy on PC, but I've had a few good games. It's pretty cool, but there are a bunch of elevators on the map and people camp them like a fiend.
The controls for 360 are pretty awful now; I don't know why they can't just let people choose their own layout.
Elevators, everywhere. They plant C4 at the entrance, and then, you know. It is especially annoying when there is no other way up.
You can control the tanks just like you can control the Scorpion in Halo. And I couldn't help but notice there are a few weapons on the map you can't spawn with, "Power weapons" if you will. I found a Barrett, which always is one shot, one kill. A powerful Grenade launcher, a Stinger, and the USAS-12, which is some sort of (Explosive round) shotgun. The Barrett is just awesome, you have 22 rounds and it is one shot anywhere on the body.