I do wish I could give more feedback on Bad Company 2, all I have to go on is a few people who bought it, and were incredibly unsatisfied. Their complaints differed, and you'll have this, with any title. It admittedly sounds very cool, but a few things, like the inability to go prone, irk me. I also hear that it's like MAG, in that there isn't a ton of variation in gametype, but I don't know the validity of that, since I've not played.
Overall the only thing that I complained about was not being able to go the prone. Otherwise the destruction you can create, the excellent vehicles, and a great campaign in my opinion made it better then MW2.