Some of u might heard about it, there is a 2D version of TF2 out and thats what it looks like:
You can download it here: http://gg2.scose.net/
The gg2b16.zip version.
Takes 30 seconds or so and the game starts in even less.
You have to be lucky to find a server, but usually there are 1 or 2 online.
And its pretty fun to play if u have less time or just want a fast "retro" game.
There are only ctf maps, and the classes are a bit different to TF2.
Engineer, has Shotgun, cannot build (or I can figure it out)
Sniper, has sniperrifle without zoom, but huge range, u will see.
Medic, has syringe gun and medigun (right click medi, left click syringe)
Soldier, has rocketlauncher with endless ammo.
Scout, has shotgun and doublejump ability.
Demoman, has stickybombs. (handle it as its in TF2, right click shoot, left click explode)
Heavy, has minugun.
Spy, has revolver, and endless invisible time.
Pyro, has flamethrower.
a,d = moving left and right
w = jump
mouse = aim
mouse click = shoot
m = selec class
Just try it.
Who needs to disguise when you have infinite cloaking powahs. 
Gonna play around on some of the other games here. 