"Shared titles don't help a system, as sales are split"
Shared titles do not help a system against the other system that has the game that is correct. But the Wii doesn't have any of those PS3/360 games. And for example in Japan the 360 hardly exists so shared titles effectively help the PS3.
"in NA more people will buy it for the 360"
Only true for the really hard-core gamers who have both systems. Normal customers will choose between the 360 and the PS3 and when most great games are multiplatform other factors come into play and the PS3 has some neat tricks like being a BluRay player. The 360 outsells it but it had the far better exclusives something that will change next year.
"Wii having exclusives makes the system a must have fort those games"
True the problem of the Wii is, that it doesn't have any of the multiplatform games. So if you make a decision between a Wii and a PS3/360 PS3 OR 360 are a must-have for those games.







