Does it count if 'not enough' people play Kerbal Space Program?
Anywho, Chase The Express for PS1. Brilliant ResEvil style shooter, on a big-ass train. Hours of fun.
Not enough people I talk to know of any of the Timesplitters franchise either, which saddens me greatly. One of the few games to have ever really nailed console FPS.
Except for XIII, which was released on everything ever. Which not enough people played.