Admittedly they haves pros as well as cons, but the cons seem to far, far outweigh the pros. Cons include massive price tag for equivelant hardware, unbelievably irritating fanboys (almost as bad as xbox fanboys), no customisation potential, incompatability with everything not made by Apple (which is also overpriced, and if anyone even thinks about saying bootcampo I'll refer you to whoever it was earlier that said that running a completely different operating system just a get compatability didn't count), overly simplistic interface, the list goes on.
Pros include...okay I got nothing.
NB. Before anyone goes off at me for being biased, I grew up on a Mac playing crystal calibur pinball at age 2. When I got a PC at about age 5 it was so much easier to use, TO A FIVE YEAR OLD! Also, the hell is with the single button mouse?
EDIT: And for those who bring up the 'no viruses' remark, I'll refer you to the Cyanide and Happiness strip on Macs which simply ended with 'Mac, nobody gives a crap'.