Vista out of the box is like OS X, pretty and it works fine. Once you start customizing it (sorry macs) with new hardware and software, that's when the problems start. I've been running Vista Enterprise 64-bit on three machines exclusively since the RTM came out, I've had to reinstall two of the once, not bad considering how much crap I play around with, uh, I mean test....
And it works great for gaming, almost no difference to XP once you slim it down to only what you need.
Will I ever install it at my company? Oh hell no! Users are dumb enough as it is with computers, Vista just makes them more agrevated after using XP for 8 years.
Server 2k8? That's another story, best bit of software to come out of microsoft to date, all but two of my servers (file and backup) are under 1GB of storage! VM's of course on VMware ESX. Core install all the way!!!!!