Time Crisis 1. It's the perfect light gun game, coming out just after 3D had matured but before the genre devolved into "you've got a huge machine gun and infinite ammo, you don't really need to worry about aiming".|
More of an arcade game of course but the PS1 version is almost perfect, especially if you can play the NTSC version.
21 consoles, 5 handhelds, 2 PCs, 1 Mac and about 700 games from the past 30 years. Every major manufacturer and developer represented. Still a fanboy for disagreeing with you.