360 userbase is based on games like borderlands. Back from xbox days, online and coop were big part of the Xbox DNA.

PS3 users had uncharted 2 which looks to be more than enough for their coop needs.

Borderlands is my GOTY BTW...right up there with Left 4 Dead 2.

this. nothing more.

PS3 Gamers were busy playing Uncharted 2 when it came out.

...at least i was :D

Because it's a shooter.... And why are surprised that a multiplatform game sold better on X360?

Well..

Look at the sales. 3/4 of the sales were sold in the US, which is the only country who takes their FPS on console seriously, as the rest of the world plays FPS on the PC. The game was also released the week after Uncharted 2.

i personally WANTED to buy it until better games came out.

Three things I can see in the sales as shown here are:

1 - the title sold way more in US on 360 than anywhere else, centering the US 360 FPS audience as key to it's success. Right now it's showing 0.75M in US vs 0.27M Others, a huge skew.

2 - when an FPS does well in US on 360 it's PS3 sales are almost always negatively impacted vs PS3 exclusives (obviously). Therefore in US the PS3 version got very little support at all with a current split of 0.22M to 0.14M in Others

3 - in general, very know franchises apart, if a multi-platform FPS does most of it's business in US then the 360 version massively outsells the PS3 version

And that's that. With titles like Batman AA and the like in ratio terms recently PS3 versions are actually doing better, with 360 seeing a smaller advantage vs the install base difference.

But not with FPS titles. This has never been the case. Heck, look at sales of PS3 exclusives in US vs outside US, and you'll see that for a PS3 title to do well it must sell well outside US and gain moderate sales in US. Borderlands simply isn't that title, having seemingly only went down well with the 360 FPS crowd in US vs more limited take-up elsewhere (both on 360 and PS3).

Besides that it is a shooter, it is also an online-co-op which leans toward the 360 more than the PS3. Though there have been exceptions, PS3 owners tend to want a single player experience.

For Dragon Age, WRPGs are more akin to the 360 as JRPG is to the PS3. (Also people associate Bioware with Microsoft more than Sony due to the old PC days and KOTOR)

or half of PS3 owners decided to buy better blu ray deals other than video games.

Three main reasons:

1. 360 has a much bigger userbase

2. It's a shooter which are generally more popular on the 360

3. It's much bigger in the USA than Europe, which plays against PS3's userbase