Moto Racer is so underrated, I don't think I've ever seen it in any top game charts, but all in all it's probably the racing game that was the most entertaining to play ever in my case, it just had such an awesome sense of speed and wild track design with countless spectacular jumps
Moto Racer 2 IIRC was decent, although it didn't leave an impression as big on me
for Moto Racer 3 I think that Delphine strayed a little too far away from the game's arcade roots, and I never tried it anyway because back in the days it was the first game to use a funky copy-protection system that messed with your PC (Tagès)
I'd love to retry the original but it's probably too hard to stare at these things nowadays, especially after having just tried MotoGP 07 on Xbox 360, and there's also the possibility that the 3D portion is Glide-only