It's quite simple.
In terms of exclusivity as we term it in the video games race. I sit there and say "What games does each system give me that I can't get everywhere".
PC has games that can only be played on the PC. Xbox 360 has games that can only be played on the Xbox 360. Wii has games that can only be played on the Wii. PS3 has games that can only be played on the PS3.
The problem with the Xbox 360 is you don't NEED an Xbox 360 to play a vast majority of their games. If you merely have an average PC nowadays, you can play and enjoy most of the good games on the Xbox 360.
So the choice then basically comes down to, Do I want to buy an Xbox 360 for Gears of War and Halo, etc....Or a PS3 for Uncharted, Warhawk, LBP, MGS4, Resistance, KZ2, God of War, etc?
Ofcourse the PS3 would be the choice.
If you have atleast an average PC, it makes virtually no sense to purchase an Xbox 360.
**EDIT**
And just because you don't want to count PC games as a platform, PC is every bit the platform that Xbox 360/PS3/Wii are. Left 4 Dead, Team Fortress, etc are PC games that were ported to the 360. It's not exclusive to the Xbox 360 period.
