Apple’s Myths Page does a good job of summing up the most common myths about the Mac. The main comment I have for people today is to stop using the same old arguments especially now that MacOS X is out and has completely changed the landscape. There were a lot of valid criticisms of OS 9 and what came before (though I was perfectly happy and productive in those operating systems) but OS X is industrial strength, UNIX based, highly mature and extremely stable.