A
arachnid
If all you do is play games, Windows, for now, is your best bet. If you
want to play around with Ubuntu so that you'll be ready for the future,
set up a dual boot. Have the best of both worlds ;-)
I'm not big on games myself so I don't know much about it, but other Linux
gaming enthusiasts have told me they use Playstation and Nintendo
emulators running under Linux to play the latest games.
It's mostly kids and young adults who are interested in graphics-intensive
shoot-em-ups and role-playing games. Older adults tend toward slower, more
intellectually-challenging games that exercise the brain rather than the
reflexes. Linux has no shortage of those.