I think I can put a nail in the coffin of this discussion right here. Although many people still speculate as to why the dreamcast, a console very much ahead of it's time with high quality games sold so poorly one theory seems to decidedly be the most popular. Basically, the theory is that Sega's previous hardware (read the Saturn) was so horrible that they totally alienated their fanbase and nobody trusted the company anymore. Everyone waited to see what the other systems would be like and by the time everyone got back to the dreamcast, it was too late. Well that and the fact that sega's never had a console software hit that wasn't a total copy-cat of a nintendo title.

So while you can certainly argue that there werent 10 great games on the n64 (you'd be wrong, but anyway) there's no way in hell you can say the saturn was a better system when it indirectly ruined sega and put them out of the console business!
For that matter if we are talking about super-de-dooper system seller titles, I challenge you to name 10 on ANY system EVER! With that being said, you usually have 3 to 5 on every nintendo system, twice as many as any non nintendo system.
Don't believe me?
Ok going down the list.......
Master System: NONE
Genesis: Sonic... umm maybe madden?
Saturn: NONE
Dreamcast: Ready 2 Rumble, Space Channel (And those are arguable)
PS1: Twisted Metal 2, Final Fantasy 7, Metal Gear
Ps2: God of War, Guitar Hero, Metal Gear, GTA3
Xbox: Halo, Halo 2
NES: SMB, SMB2, SMB3, Metroid, Kid Icarus, Zelda, Duck Hunt (Yes as crazy as it sounds it was a console seller... shades of the future wii titles)
SNES: SMW, Super Metroid, Zelda, Mario Kart, Starfox
N64: Mario64, Goldeneye, Mario Kart (I'm going to omit further games on this one for the interest of fairness as I know for certain that these games sold really well.)
Gamecube: Zelda, Metroid Prime, Metroid Prime 2, Resident Evil 4, Smash Bros., Mario Sunshine (even the turd of the mario series is still good), Mario Kart
I'm not saying that any of the other systems aren't enjoyable, far from it, but if we are going to get into a discussion of which company's consoles churns out the most system sellers then the list is generally:
Nintendo (Note that depending upon your opinion these two can be swapped around for 1st and 2nd place).
Sony
Microsoft
Sega
While I'm very fond of sega's arcade efforts, looking back they really are a poor software company, and an even poorer console company. They were really a third-party quality company pretending to compete (and for a time they were very successful) with nintendo. Eventually the public caught on and now they are demoted to (gasp!) a third party developer. Sony is a wierd animal, they ended up with console sellers, it's just they didn't make the games or really have anything to do with it other than convincing developers to make games for their systems. M$ tried very hard to make their own stuff, but have about a 50/50 success rate. Nintendo is the king of software, with nearly every in-house title being a major hit.