Don't forget Daytona USA. Despite the fact that I completely SUCK at racing games, Daytona is fun & great w/ the NiGHTS analog controller.
I think people forget that the "lack" of 3D Saturn games they seem to complain about is just the smaller overall library. The PS-1 had a HUGE library of games, but about 2/3 of it is crap. How many incredibly terrible 3D games came out for the original Playstation? LOADS. I'd venture to say the PS-1 has the highest ratio (other than the N64 or Jaguar) of crap to quality releases. But the sheer size of the PSX library lent itself to a lot of great titles, as opposed to the relatively small US Saturn library, which had some great titles, some mediocre stuff, and a lot of crap. It's a numbers game. The NES suffered from this to a lesser extent - toward the end of its life it started to see a lot of lame games made by publishers just trying to milk the popularity of the format.
I'm am a happy Saturn and Dreamcast owner. I think both systems were high quality, despite their issues. I have several great games for each, and have more domestic titles to acquire for each. The idea that the Saturn game out too soon is probably right, but never in a million years would I believe a cartridge-based "Neptune" would have been a winning proposition for either SoJ or SoA. As was eluded to before, the N64 proved that to be true.