[quote name='YBX87']how does the match making work exactly? can you create your own game, and invite friends to it? or are your options only public games? on most youtube video i have only seen coop with 2 players at most[/QUOTE]
It's pretty standard stuff. You can choose Quick Match to join someone else's game in progress, or start your own session either solo, invite only, open to friends only, or open to randoms. If you're starting your own session you can choose a level or continue your campaign from the last checkpoint that you stopped at.
So far I've always hosted my own session and made it open to randoms, and the game will put a second player into my game right away, but never a third or fourth.