SNES. I still love 2D games and virtually all of my favourite games are on it.
More recently, the DS. The mix of SRPGs, dungeon crawlers, adventure games (Last Window, Hotel Dusk, Ghost Trick, Phoenix wright etc) combined with plenty of 2D goodness like the Castlevania games, Contra IV, Aliens Infestation. It had pretty much everything I like in gaming.
PS360 made me utterly tired of third-person shooters. I played and enjoyed a dozen or so, particularly the Gears, Dead Space, Uncharted, Resident Evil, Binary Domain and Mass Effect games, and played loads more besides, but I'm just not interested in them any more, I feel like I've crouched behind enough convenient waist-high walls to last a lifetime. Same goes for Assassins Creed/Far Cry/Ubigames. Maybe something this gen will spark my imagination again.
Even more recently, the Vita has introduced me to a hell of a lot of smaller titles that I wouldn't have played otherwise. And the Ys series.