What you mean By 2 MP Modes? Its like this
Main Menu --> 1 One choice For Multiplayer
Now when you press on MP it will go you to another screen when you Have 4 Choices
Play now
Ranked Match
Players Match
Invite friends ( not so sure)
Anyway Now i always go on with Play now its more fast.Then you have to Choose You Assasin From i think 9 Assasins.And then You Play
There are 2 Games.
First Is named WANTED
In the ‘Wanted’ mode, it’s every Guy for themselves as the player selects an appropriate persona and is loaded into an map that is filled with AI controlled duplicates of all the active personas selected.You can then locate your target using a compass that indicates direction, height, distance and line-of-sight, placing them within the vicinity of the target allowing them to use their observation skills, wits and intuitions to correctly identify the target and bring home the pain.
2nd Called Alliance
three teams go head to head with each team expected to hunt another team out while being pursued by another, and ‘Manhunt’ where one team hunts while another attempts to hide
Assassin's Creed Brotherhood's Multiplayer is something truly unique to enjoy and is certainly my multiplayer game of 2010 that I know I'll be coming back to again and again. , it does have niggles and it certainly takes some time to adjust to the Brotherhood paradigm.