Halo ended for me during Reach. I've played all of them. I even enjoyed 5's competitive multiplayer a lot but didn't stick with it. But the real problem for me is that hardly anyone's making that type of shooter anymore. Everyone made battle royales, and now they're all making extraction shooters, but I just want a solid campaign with some good levels and an exciting story for like maybe 10 hours, and then repurpose some of those campaign levels into multiplayer maps for 4-8 players in LAN and split-screen. It doesn't need to sustain an online population for 6 years, and it's often preferable if it doesn't. Sometimes it'll happen by accident.

Maybe that rumored new TimeSplitters game will be that. Or maybe this "boomer shooter" fad will evolve to move from the late 90s style into the early 00s style of FPS.