Haha, look at all you casual gamers talking about your Sega and Nintendo systems, thinking you were so hardcore.
True gamers were only about PC ENGINE, or TURBOGRAFX-16 to the suckers who got stuck with Keith Courage. Tons of innovative games, hitting that sweet spot between the 8 and 16-bit era. Getting a DUO (or CD attachment if you like spending money replacing them) also gave you a huge CD library, right before the FMV "game" boom hit the west so you got actual good CD games with kickass music. Sure, the majority of quality software never left Japan, but that's not one to stop REAL GAMERS, right? It's a goddamn shame that NEC completely botched the PCFX and turned it into an anime-box full of FMV crap.
The Genesis also had kind of an underground and indie feel to it before Sonic hit and things exploded. I guess it's also connected to the state of PC gaming back then, I remember when Phantasy Star 2 came out people were marveling at how it was the kind of game only available on high-end computers at the time. In a way, the PSP is kind of like the PC Engine, lots of good games released but most westerners will never see them.