Not true, Apple breaks core features in minor security releases all the time. Most recently, they broke the system Perl. I don't use OS X for anything important anymore (only for watching videos on my TV), but back when I did use a Mac for work, things randomly broke for no reason all the time. (That doesn't even include the nightmare that is ports / fink / whatever, required to get modern versions of UNIX programs.) I use Debian unstable now, and it is a lot more reliable than OS X, for me anyway.
Also, the whole getting wifi to work thing is mostly solved now. All the wireless cards are Intel, and Intel pours a lot of money into making them work really well with Linux. So you pop in your Ubuntu or Moblin CD, install, and right click the little icon, just like on any other OS.
Basically, OS X sucks, Linux sucks, and Windows sucks. So there is no real reason to get super-excited about any of them -- they are all basically the same, with Linux marginally better in a few cases.