Its not about brand or OS, really. All computers can and will have problems.
In a home environment there’s really little bad to say about Macs. They are good machines.
But in a corporate network they require much more care and feeding than an XP machine. Everything they do is more complex because they just don’t play nice on IP networks... Especially with a Windows AD architecture. Its almost like there is some ghost of that hideous appletalk living somewhere in the machine. :-)
You can turn off Appletalk. In fact, unless you have old printers on your net or are trying to network with OS9 machines, you should.
But I can see where there would be networking issues in a Windows environment.
I have an OS X network at my office, never had any issues. In fact we replaced 5 Compaq Proliant servers with one OS X server. Our support issues have dropped to almost zero. When we were running 2000, there were constant support issues.