Hmmm I suppose it all started with a Printzsound [sp] thing that plugged into the telly and let you move lines that pretended to be racquets around to hit a blob which pretended to be a ball...called itself "tennis" although the "football" one was pretty much the same just with more blobs, kinda like primitive electronic table football. That must have been about the time that I was pestering my parents for 10pence pieces for a go on Space Invaders.
I had a coupla little hand held Pacmans and Donkey Kongs, then a 48k Spectrum, favourite games being Way of the exploding fist, Spyhunter and Attic Attack.
Then I stopped playing videogames for the best part of 15 years until I bought a PS1 Gran Turnismo 1,2 and Soulblade owned that, just as Gran Turismo 3,4 and Rachet & Clank own my PS2.
P.C wise the games I've lost most time to have been Unreal and Unreal Tournament 99, but I gave up on the UT series when UT2003 introduced all those silly disco stu break dancing moves and fubared the weapons [Thanks Cliffy B].
These days I'll play just about any FPS with a strong single palyer storyline, recent favourites being Far Cry and F.E.A.R. Multi player is taken care of by BF2/Special Forces, and other than NFSU2 & MW [which I happen to love :P] LFS is the only other game I have installed.