[quote name='terribledeli']What about Call of Duty 2? I believe Activision claimed the game nearly sold 1:1 with the console.[/quote]
Call of Duty 2 did sell very well, but it sold because it was the best game on the system at the time. People who bought a 360 were buying it for future games, not COD 2. The supposed killer aps, Perfect Dark Zero and Dead or Alive 4, just didn't deliver. Also, COD 2 wasn't exclusive as it was avalible for the PC at the time. Resistance, on the other hand, is exclusive.
[quote name='terribledeli']Also, I don't think you can honestly consider Virtua Fighter 5 a killer app. This isn't something that has a wide spread following like Tekken. A major show piece for the console, yes, but I don't hear too many folks wanting a PS3 exclusively for VF5.[/QUOTE]
A lot of people will disagree with you. Part of the reason why people aren't clamouring for it to be exclusive is because it was announced as a late Summer 360 game, so it's that whole timed exclusive thing. Virtua Fighter 5 still stands as an incredibly important game for the PS3 though. While Tekken may have a bigger following in the US, Virtua Fighter 5 has a much larger following in Japan. Furthermore, the hardcore Virtua Fighter fans will drop $500-600 on a new system for a new Virtua Fighter. Furthermore, Virtua Fighter always sells well on whatever console it's on. It is still the holy grail of fighting games in many people's opinions including my own. I consider it a killer ap simply because it blows away any fighter that the 360 has to offer and it will sell more PS3s then any other game on the 360 besides GoW, Oblivion, Dead Rising, Madden, and Halo 3 (since a lot of people are buying 360s early for Halo 3).