I figured out my problem with first person shooters!!! I played Tribes, a lot. There is a fundamental boredom to these games (for me), regardless of how well they are done. The combination of managing your flying, and managing projectile travel and lead times, has forever soured me on ‘run around on the ground and shoot stuff’ mechanics.
Seriously not trying to take anything away from AL et. al., just a revelation for me. This is why every one of these games leaves me cold. Carry on.