There are a couple reasons. First, they are designed ONLY for games (unless they are a certain system that was designed as a Blu-ray player, not naming any names) so the hardware is completely tailored for games. Second, the code for those games is universal so extremely clean. When you program for a PC, you have to code for lots of different setups. Not so with the consoles. Next, they use existing engines that are already very clean code. Then you have the fact that they often turn AA off or have it very low. Couple all that with the fact that anyone with a decent PC can tell you that PC looks significantly better on max settings and that 360/PS3 games look like PC games on medium, and you have your answer
Long story short, since the components inside all 360s and PS3s are exactly the same as the components in other 360s and PS3s, the game can be optimized to run on that given hardware perfectly.
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