I've been playing FPS's on PC's since the days of Doom, Duke Nukem, and Quake. That's about 20 years worth. And I started in my 50's.
Just finished Just Cause 3. (Open world) Heard that the new Doom is very good but I'm waiting for the price to drop about 50%. Another one of those games that can't be cracked.
I've played most of the Metal of Honors, Call of Dutys and many others, but getting tired of the regimented play-through types. Prefer the open-world type of FPS. Some of the games I've played...
Half-Life, Serious Sam, Far Cry, Halo, Borderlands, Deus Ex, F.E.A.R., Wolfenstein, Portal(not FPS), BioShock, Doom, Unreal Tournament, Aliens vs. Predator, Crysis, Star Wars Jedi Knight, Soldier of Fortune, ******* Rampage, Red Faction, Painkiller, etc, etc.