User blog comment:Legionwrex/Multiplayer to have an impact on Story?/@comment-3268946-20120128015152/@comment-1221773-20120128063319

I'm pretty sure it's War Assets that affect Galactic Readiness, not your individual performance in a given mp match. From what I understand, War Assets would be like rewards (like a fleet or troops) for winning matches that build towards a constant total; losing in an mp match would only mean you don't earn a particular Asset, so GR wouldn't increase.