I still reckon timed exclusives are a HUUUUUUUGE waste of money.
If Microsoft continues to pay large amouts of money so that certain people (PS3/Wii owners) can't play games, then they're not gonna win many fans. Why not spend the money on game development instead of timed exclusives?
I know Sony's been guilty of the same thing now and again, but it's not very often and they do spend a hell of a lot in game development too.
And Obviously, Nintendo don't really need timed exclusives due to the Mario/Zelda/Wii Fit/Pokemon goldmine they own!
The dude abides