I used Macs for music and audio editing stuff while I was in school, and I like the OSX interface (especially being able to uninstall stuff by just deleting it). As far a crashes go, I think there may be fewer crashes caused by the OS alone (hard to tell, though), but programs themselves screw up as often as on a Windows machine.
Aside from the lack of hardware customization, what I dislike about Macs really stems from the fact that I don't like Apple as a company all that much. The only Apple software besides the OS that I really like is the high-dollar stuff like Final Cut Pro and Logic -- I hate iTunes and iDVD, and for example. Not just dislike them. Hate them. OSX and the bundled software are not in themselves enough to make me spend hundreds of dollars to buy a Mac. The only reason I would buy a new Mac (I own an old iBook) would be for the Mac-only software I like. Meaning Digital Performer and Final Cut Pro, both of which have PC alternatives (SONAR, Avid).
Also, I can't stand Apple's trend of updating the OS every year and breaking half of the available third-party programs until they get patches three months later. And it rubs me the wrong way when they (and Mac fans) crow about how Macs are so cool because they can run Windows, too, when the only reason OSX can't run on a PC is because Apple goes to great lengths to make sure it can't, because they want to sell hardware in addition to software.