You forgot the price.
Intel graphics aren't that bad, the newest HD ones are capable of running decently. They're not the best, obviously though.
I love it when Windows users go around calling Apple stuff.
And I love it when Mac users act like we're calling it stuff because we use Windows.
Mac OS X is okay. Apple, however, is really bad at making a decent computer.
Long story short: people buy macs because they're stupid and are willing to throw $2000 at something that is worth $800.