There are two different arguments here:
1) Apple axed xserve and basically made it a risk to depend on osx servers (they may decide to axe the mac pro without warning). This is a legitimate argument.
2) The OS feels more consumer based and buggy. I think osx coasted on the lack of popularity for years (if you are writing malware, are you going to target a small mac population or the wide windows population?) and the market penetration is improving. So what we are seeing now is the world adjusting to the idea that osx is a more popular OS.