NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO!!!!!!!
I don't think this is a good idea. Mass Effect already has quite a large following with its first two games. Sure, from a business perspective ripping off Call of Duty might be smart. But businessmen need to stop talking business and start playing some games every now and then. Games that aren't Call of Duty or Halo or Battlefield, or something like that, usually don't get a following. The lobbies are usually empty a few months down the line, or have very few people in them. It takes something different to stand out in the multiplayer crowd, and you can't rip off another game and expect the same level of success. It just doesn't work that way. Business is an important part of games, and I think either EA is making Bioware add multiplayer, or they're pushing it, or Bioware is getting greedy, whatever. They're putting multiplayer in a Mass Effect universe to attract more business, and the people that prefer multiplayer already have their Black Ops and Halo Reach's to satiate their friend-killing, noob-tubing lust.
EDIT: I'd also like to have to eat my words whenever this comes out. I just don't see it happening. ME games are more about story; left alone to gameplay, which makes up the entirety of multiplayer, they end up being very repetitive, generic cover-based shooters. Like it or not.