the 360 cannot compare in reliability though. and the lineup of games isn't better most of the top games aren't exlusive like halo and bioshock
One problem with the 360 is just down to how the programmers set about Caching the games, since most of the time the information either has to be loaded into memory or being directly read of the DVD. This of course can cause problems and for the most part those Three red lights of death that are so infamous with the first batch of XBOX's can be linked just to the DVD drive failing alone.
For instance there is a fair amount of difference in the way Oblivion plays on the PC in comparison to the XBOX. The XBOX you have to wait occasionally for load screens to pass as you move between different areas (which occasionally results in a crash), on the PC if you have enough RAM, swap space and a full install there is very little load time.