Aww, this is so a myth! This may hold true for PowerPC Macs but not since Apple moved to Intel. Actually Apple offers the best performance on the market in notebooks for example. Check Notebookcheck.com or some other independent notebook-testing community.

And the program compatibilitay issues.. You will have the very same on Linux.. in Video or Graphics-Editing even worse.
I would say OS X has more compatible programs than Linux.

BUT! I don't want to start a debate, since people base 90% of their decisions not on rationality but on emotions and prejudices, which there are many against the mac, so.. I know you will not listen to me :P