Nope, Mass Effect 2 is like a million times more popular than MAG. Check the Amazon sales charts for example, or just any indicator of hype like forum threads.
PS3 barely beating 360 despite being 299 and the same price as 360 now. Never thought I'd see that day. Wouldn't be suirprised if 360 beats PS3 in NPD.
A couple things
1. Mass effect will sell more sortware than MAG, but people who want to play it already own an xbox - therefore little hardware increase
2. Xbox is still cheaper than ps3, and getting its ass kicked worldwide. Even a small loss in its home territory hurts.
Time for hype