I love survival games and I have all the consoles naturally I have the "Resident Evils" and the "Silent Hills" games.
Here's were Valve comes up: I have a 5yo computer so Left 4 Dead can't play on it. That leaves the 360....

One fact that escapes people when they try to find out what console is wining is that some consoles are more popular than others on different regions in other words the 360 my be a huge success on the US but in the EU will all ways try to prove it self, and since this is a game of numbers MS is focused on only three countries (UK/Fr/Ge) that leaves the other 50 countries with 10 copies, not for each country but 10 copies for all of the 50 countries.

So finding Left 4 dead on the 360 is impossible to find. In other words I got 59€ ready and willing to give it to MS/EA/Valve. This would be much easier if Left 4 Dead was on the PS3. Because unlike MS, Sony and all the 3rd party companies makes copies for everybody I can build a house made of NFS:U or NFS:PS for the PS3.

If only there was a multi-platform game that had a zombies mini game the got so popular that is now becoming less and less .... ... ... mini.
For the record I'm not a fan of Treyarch, I stop playing CoD3 mid game because I couldn't get pass the decreased quality from I.W. to T.a., so it becomes apparent that the zombie mode and all it's add-ons in "Call of Duty: World at War" for the PS3 thus not only is Sony/Activision Blizzard/Treyarch getting my 59€ but the money for the DLC too.

Has for the 360, it still has keep the name "The Mass Effect Machine" or even worse "The Peggle Machine"
Activision Blizzard and Treyarch keep making tons of money and probably they will make a stand alone WW II zombie game that will sell equally tons of money. The journalist and bloggers of this world will argue that Valve is way better than Treyarch at making games but the games will keep tons.The people a use the PS3 has they main console or only have a PS3, will just not care.