I'm UK based and I've pretty much had a solid 4 bar connection since release...I've never been happy with the quality of some games I've had, Migrations and such.
I downloaded vengeance on Tuesday, wasn't too fond of the maps so I deleted it, Revolution wasn't great either so deleted that also. Now that leaves me Uprising plus the original maps. Which in theory should reduce my matchmaking possibilities quite considerably.
I'm now not playing with many Europeans, mostly States based players, and I'm constantly on 3 bars. I've played about 20 games on the bounce and not 1 migration, also the quality of games seem so much better.