Heh, I actually have Heavy Gear II around here somewhere.
I had MW4 at one point and I think I ended up returning it for some reason (back when you could still do that with a PC game). I'm not really sure what it was, but I had less money back then, so it probably just wasn't exactly what I wanted it to be and there was something else I couldn't afford if I kept it. I don't know.
I'd be curious to download it and try it out again, though, especially if it supports multiplayer still.
Mechcommander was awesome. I never did try the sequel because I didn't like that it was 3D. I loved the 2D look of the first one and thought 3D was really a step down.