Started off with the original Doom head-to-head online over a dial-up with a 14.4 modem against a mate. Progressed onwards with Quake and a Voodoo pass through graphics card (remember them?).
Not bothered with pc stuff since my son bought an xbox 360 as a pc just seemed to be a money pit at the time to keep up with the needs of the latest games. Theres a massive catalog of xbox stuff available in comparison and I can get a lot of gameplay buying used games at Game for a tenner.
For a quick console retro blast of something can't beat one of the flash game sites.