Which are the best multiplayer games on steam?

The Ship

Most games in this list

Tell me what kind of games and I can help you more.

Edit: Play TF2 or Terraria with friends.

Differs per person, I'll just tell you that you'll need to specify your tastes right now, because otherwise people will just keep spewing the same popular stuff

According to http://store.steampowered.com/stats/, the top ten games being played right now (9:11 am, EST) are:

Current
134,764 Dota 2
37,709 Counter-Strike
34,741 Team Fortress 2
31,776 Football Manager 2013
23,534 Counter-Strike: Source
20,466 Call of Duty: Black Ops II - Multiplayer
17,998 The Elder Scrolls V: Skyrim
17,895 Sid Meier's Civilization V
13,026 Counter-Strike: Global Offensive
12,623 Call of Duty Modern Warfare 3 - Multiplayer

borderlands 2, l4d2, alien swarm
and somehow, i dont like dota2 and TF2

Depends on what you're looking for. Fps? Rts? TheShip?

Depends what you like, if you like FPS you should try Team Fortress 2, Tribes: Ascend and maybe Planetside 2. They're all F2P so you have nothing to lose :P

Red Orchestra franchise

Dota2, Civ5, TF2, L4D2, Borderlands 1/2

Go play DayZ. It's lots of fun, it's the ONLY game where the kills are rewarding and being patient pays off.

Left 4 Dead 2 :P

Might and magic games... though turn based isn't for everyone ;-)

Dungeon Defenders has the best co-op gameplay in my opinion. Other games I'd recommend are Team Fortress 2, Terraria and Magicka.

The trine series was a lot of fun.
Magicka is fun, but try the demo first, the controls are odd and my fiancee got fed up with them before we finished the game.
Team fortress 2 is pretty good.
Don't Starve is supposed to get some multiplayer 'elements' sometime in its future development and it's a heck of a lot of fun right now.
Portal 2 had a really fun co-op mode.
I suppose it depends on what you mean when you say "best multiplayer games" When I think multiplayer I think of 2-player co-op games more than the 8-16+ online arena games. I suppose if you're talking more than two or three local friends there's a handful of mmo's on steam that are good, FFXI, Realm of the mad god, Spiral Knights (those last two are free, but lose some of their steam after a week or so of playing)

Arma II(not DayZ), is pretty fun when you play multiplayer. It has coop campaigns, scenarios, and the redundant skirmish matches. I don't see a lot of people playing this game, so it's pretty underrated. Give it a try.

Killing Floor, not really an underrated game, is also a lot of fun. When I first got the game, I played for at least 11 hours the first day. It's really fun, a bit repetiive, but that's why you join different servers.

Splinter Cell: Chaos Theory, L4D2, Tribes:Ascend, Trine 2, Torchlight 2

Warlock: Master of the Arcane, Killing Floor, Jamestown (not online), AI War, Men of War: Assault Squad, Sword of the Stars 2 (Now that it has been properly patched), Company of Heroes & Dawn of War (Dark Crusade or Soulstorm)

You don't own Killing Floor.

just cause 2 multiplayer mod looks pretty fun:)

Battlefield 3.Yes it was on steam.

APB Reloaded!

Dota 2, CS: GO.

Dota 2

Shoot Many Robots (1-4 players), Dungeon Defenders (Very good game.)

F2P: Tribes:Ascend, SMNC, TF2

counter strike 1.6