I agree to some extent, because there is a bit of grey area here for me.
If a game is set as an exclusive, keep it that way. Don't come out a year later and say it will release on another platform, because that is just annoying.
And the MW2 mappack that now has a 1 month exclusivity on the 360 is the stupidest thing I have seen in a long time. It's not going to make any difference at all. I wonder just how much Microsoft payed for that.