Shattered Horizon

Is extremely unpopular. You'd expect otherwise since it is the best looking game in history.

That's beside the point, though, because it is the most amazing multiplayer game in history. You'd think it's like Quake III with a zero gravity mod and leet graphics and one gun, but it's much, much more tactical than that. The setting is incredibly unique, allowing for more interesting tactics than simply using a cover mechanism. You can turn your suit off and hide in the shadows to perform stealth kills, allthewhile not being able to hear a thing or use a HUD because your suit's luxuries are gone. Your gun provides all of your necessities: a bayonet, automatic mode, sniper mode, and four nades of three different (all useful) configurations. However, it doesn't feel like the bare minimum because each mode is incredibly worth using in various situations.

The modes are very classical, being only deathmatch, team deathmatch, and control points, but the maps are huge and full of cover and holes, allowing for you to flank the fuck out of everyone without them noticing because they're all either in Alaska or near you but with their back turned to you. It more than makes up for the lack of a gazillion modes.

And damn, it's so tense when you turn your suit off and all you hear is your breathing and the satisfying thud of your rifle firing.

But alas, you can't play without Vista or 7. So anyone with Windows Vista or Windows 7 should get this. It's on Steam.

Sounds pretty cool. Imma go google this

You may see reviews criticizing its few maps. There has been some large free DLC updates since then, so the game world is more varied.