Truth is, there is a multitude of reasons.
The first poster pointed out screen resolutions, which is certainly one of the issues. But there's more issues than just that...
Excluding the Wii (of course), the Xbox 360 and the PS3 have completely different hardware and media formats. Typically a game is designed for the 360 as the lowest common denominator and then "optimized" for the PS3 version. Because of this, you may see more visual issues on PS3 versions, but slightly better graphics. Frame rate drops on PS3 is also common vesus the 360 versions of games. Both consoles also have different methods in which their Hard Drive's read / Write. This also poses a problem for developers.
Besides the above, there is also the business aspect of things. Developers can work forever on a game till they get it perfect if you ask them what they prefer. The publishers that support them however, impose deadlines which affects release dates and therefore the quality of the game released. To meet deadlines and avoid late release fines, you will often see a game released with a few issues, and by the time the game reaches stores, it already has a patch available to rectify some issues they didn't get to in time.
But ultimately, the real issue is this:
The more sophisticated the software, the more problems you invite.
ie: If you don't have power windows in your car, you don't have to worry about the motor for the windows being faulty.;)
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