Counterpoint: the Windows mouse acceleration is terrible. Messing with the cursor speed doesn't help, it's impossible not to end up with jumpy moves and constantly overshoot buttons and menu options (doubly so menu options since the single convenient always-at-the-top-of-your-screen menubar isn't present).

If you grew up with one system, the other is horribly broken and I'd argue nearly impossible to learn. I'm a graphic designer who used Windows for years at work without ever "getting used to it", even if I never came home and touched my Mac. Now I work full time at home and it's heaven to have a mouse/cursor that does what I want it to do.