I mean a 1940-2000 type shooter. Seals vs Terrorist. Commandos vs Mercenaries, AK47 M4A1 as assault rifles, SMGs P90, Machine Guns, MK47. then have shotguns, snipers, hand guns... This is like the fudamental type of shooter, you gotta have shotguns which blast people on their Ass and they tap X really fast to get up or get in 1 or 2 shots off while getting up and get a head shot or something. Snipers are pretty much 1 shot unless super far away then 2 shots, machine guns are good for spraying in close areas and sniping in medium to long range, SMGs are to be fast when your running around so your not too slow so you can get to specific parts of the map as the round starts. Then assaults are for general use.
Alien games lack this, typically they got weird space guns.