Namco had a really turbulent track record when it came to the Duo. They had some hits, and a large quantity of misses.
Final Lap Twin is definitely one of the former.
Were there any other Namco titles brought over to the states?
Lots: Splatterhouse, Samurai Ghost, World Court Tennis, Pac-Land, Galaga 90, Ordyne, Bravoman, Dragon Spirit, etc.
Most of the real stinkers never left Japan, but we did get World Court Tennis, Ordyne, and Bravoman. And personally, I don't think Dragon Spirit is anything to write home about.