I never quite understood why people always take Bioshock1/2 to be a UE3 gameDigital Foundry just released their ME2 analysis video which also contains ME1 framerate video for comparision.
http://www.eurogamer.net/articles/digitalfoundry-tech-analysis-mass-effect-2-article
Similar to the other recent Unreal Engine 3 "biggie", BioShock 2 (see our triple-format face-off elsewhere), Mass Effect 2 runs with no anti-aliasing on either platform.