Not true for me at all.
Some people have problems, but it is almost always either unsafe practices (browsing unsafe sites without proper precuations, clicking spam executables, other stupid shit) or dodgy hardware/drivers.
Windows has a lot of hardware/driver problems because it's an open system. Anyone can make the hardware (there are licensing fees and shit, but irrelevant) unlike Mac which is locked in. It's a lot safer and more reliable to use a Mac for that reason. Windows systems are a lot cheaper and more flexible or cutting edge performance and capability for the same reason. And yeah, sometimes there are incompatibilities which can show up as random crashes if you're unlucky.
I have to install updates like once a month. Windows downloads them in the background and I click yes and sometimes I have to reboot. I can't tell you the last time I crashed; it's been months, and it was the direct result of trying experimental software (warez). The last "random" crash? Much longer. Windows XP is remarkably stable for me; much more so than any other Windows OS I've used.
Virus outbreaks are a function of the popularity of the platforms, and the stupidity of the owners (wide open routers, etc.) Windows may be innately less secure, I don't know.. and I don't care that much. For me, the benefits outweigh the problems.
Windows works for me. I'm productive, I have very little downtime due to patching vulnerabilities. I have a lot more software to choose from. YMMV.