Yes, it's Unreal Tournament 3. In the very first image, that 3-legged machine thing is hard to beat. It starts out with 1,000 hit points while we only have 100 hit points. So it takes a lot to destroy it. However, it's only controlled by whoever gets into it. Otherwise, it just sits there and does nothing. A Liandri ship delivers the "mech" vehicle in a drop off zone where anyone can get to it. I control that thing a few times and hate it. Very slow moving and very inaccurate shot, but very powerful at the same time!!!
The only reason why I would get into the cockpit of that thing is so the enemy won't get it. Teh computer does a better job of aiming so you're most likley dead when you confront it. I usually get to it first and do as much damage as I can, then I get out of it when the enemy hits me enough time. By the time I get out, the mech is already badly damaged. When the enemy get to it and use it, all I need is a few shots to kill it, hehe.
Yeah, I'm a cheater that way.