I'd have to say the whole FPS scene myself. I never saw what the big deal was with DOOM back when that was state-of-the-art, and I never really cared for where that genre went after it. There are exceptions of course, {currently enjoying Perfect Dark actually} and when I do play them it's for the single player campaigns mostly, as the whole online/LAN party things with 10 + ppl four hours upon hours on end just never made much of an impact. An hour and a half at best, then I was off to do something else. Which is the reason I still don't see what the fuss is with HALO as a franchise overall. I've played it and just didn't care for yet another Humans vs. Aliens schtig, but I did love the JIN-ROH looking KILLZONE despite it's many flaws, primarily for it's rich enviornment and it's politically charged overtones between two strains of the human race.
The other "Boat" I missed was truly getting into the zone with VS. FIGHTING games of any kind be it 2-D or 3-D. I mean, yeah... I played them pretty well, enough to hold my own for a bit but never to the point where I studied up on moves and counter moves etc. etc. I just played them for fun. Now I actually take time to TRY, the key word being TRY to see the more dynamic aspect of the Vs. Fighting genre, but still treat it as a genre I like to play to let off some steam and have fun but know I'll never be some ubber cool dude who can whip anyone's ass on one whole half of the planet. To this day my genres are still all about RGS, Shooters, Action/Platforming, Gun Games in that order.
MERCENARY X99