Good First Person Shooters?

It all depends on what you consider good content in a FPS. Myself personally, I like realism, and I think at the moment, that the only game that offers this, in modern military terms, is Arma 3. Not for everyone, but if you like your milsims to try and encompass all of the small battlefield details that matter in real life, and you have a powerful enough PC to cope with processing demand, and the skillset to take on and learn the various control aspects of the game, then this might well suit you. Just remember though, everything is an individual experience, and is very much subjective..