I never have to defrag, nothing to maintain, AH and many many modern games run great (using cedega) ALL of the software I will use is on the distro disk, there are so many distros to choose from, you can find many tailored to your exact needs, including gaming. TONS of free software that do ANYTHING under the sun are available.
BTW, I am not a strict Linux user, I also use Win7 - Which is AWESOME! It is also EXPENSIVE. I really believe Win7 is the best thing MS has put out in quite some time, MUCH trimmer than Vista with speed as good as XP, in 64-Bit it beats XP IMHO.
I also run XP (and all MS OSes back to DOS 5) as a virtual machine under Linux when I MUST use a MS specific program - perhaps I could use Wine but Virtual boxes are the way to go for seldom used programs, etc...
I was just pointing out that Linux is a cheap way to get speed and security