Personally, I find mac's to be quite alright to work with, never done any 3d work on them though, just movie editing, flash, webdesign and photoshop/printing stuff. And they seem to be pretty fine for people who are 'computer illiterate' as Emil mentioned
I'd never use on as my personal computer at home though, mainly due to their limited software compatibility and restricted options towards customization/upgrading. Oh, and the fact that fixing hardware failures on a PC usually only costs about 15% compared to 'having to' send it off and getting your mac repaired, even if you know what is wrong.
As said, actually working on them is quite alright though. BUT, I have to agree on the point that Apple really seems to be desperate running those kind of commercials.. Cause we all know how perfect...
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