Warning: Vulgar language, adult jokes, and copious amounts of sarcasm ahead!
By now I somewhat expect everyone has formed their opinion of the single player campaign of Mass Effect 3...and while in my opinion the game is 99% awesome and 1% wtf-ending!? Some have argued that it is not worth its price. Thankfully for me, Bioware thought to include a multiplayer function, which actually is one of the more fun multiplayer games I have played in a while.
In short summary, it's a "Horde" or "Firefight" (Failfight?) sort of game with 4 players which fend off progressively larger, tougher waves of enemies from one of three enemy factions (Cerberus, Reapers or Geth) on one of six maps. Its a team game, with each player getting the exact same amount of XP and credits at the end of the match, meaning Goblins will hate it (though I have yet to encounter many "M&S"). There are three difficulties; Bronze (the LFR of ME3, everyone wins), Silver (Normal Mode, requires some skill/coordination), Gold (Hardmode; requires team cooperation and a good combination of classes, but will likely induce rage) and the rewards scale up with difficulty. Each player picks a class, and in each class are 3 subclasses (split into races from the game).
So off we go, complete with Resurgence DLC update!