Why does the Xbox 360 have trouble with anti-aliasing?

[darkely]

Or get a good gaming PC and play with 8-16x AA and dont worry about jaggies anymore.

Maybe you did not see the text in my original post...

Note: please don't bash me for playing 360 I don't have that much extra money to upgrade my GPU and what not. As you can probably tell by now I have more than one question... No flame wars please.

Any way I just got my first real job so once I get some money I'll upgrade - or I will just feed Micro$oft rather than have my hardware going obsolete within a week.