The best light gun shooter I've ever played is a small VR game: Space Pirate Trainer. You're just standing on a landing pad shooting down waves of robots, but it's incredibly well balanced, has an ingenious dual-wielding system allowing you to prioritize protection or various kinds of firepower. You'll leap around, duck and throw yourself to the ground trying to evade the merciless onslaught. It's a ton of fun and a surprisingly good workout at the same time.
I'm mentioning this game, because I think that VR shooters are the modern-day successors to light gun shooters. Many players are so fully immersed in the latter already that they are instinctively ducking and evading enemy fire with their bodies, even though it has no actual effect on these games. In VR however, it does and the way you are aiming and firing is identical, albeit not limited by a static screen.