[SCVirus]

I wouldn't use windows if I had a choice but other Operating systems are hardly useable for gaming. And there is far more in SP2 then net security, all of the core system has been recompiled to be more resistant to stack overflows and they have included quite a few previously unreleased security fixes as well. Anyone who does not update to SP2 and has an unprotected connection to the internet is going to get autohacked by some XDCC kiddie as soon as (or before) the vulnerabilities addressed in SP2 are released to the public.
I am not 'paranoid' about windows updates, they have a horrible track record. They fix a security flaw and break a bunch of the applications i use. Its not worth it considering there is a far better option.