The thing I hate about these timed exclusives is the fact, that you never know for sure said game is timed or not. If I were to buy Xbox for ME2 or Splinter Cell and than later it come on PS3, I'd be so pissed since those are the only interesting games on that console for me. If BioWare releases ME+ME2 on PS3, I'll ritually burn all of their games that I own (no I won't, I like them too much... but you get the point).
So the only thing that MS has achieved with their timed exclusives in my eyes = I hate Xbox more.
MY HYPE LIST: 1) Gran Turismo 5; 2) Civilization V; 3) Starcraft II; 4) The Last Guardian; 5) Metal Gear Solid: Rising