when it comes down to it, all you do in these games is run around in a sandbox and shoot or throw stuff.
BF is different in that it's less sandbox and you can get in vehicles and blow up buildings.
CoD is only good on hardcore mode. everything else is garbage, other than gun game and the mini stuff (counter-strike esque)
i miss the old medal of honor series. not only did you feel like you could work together well with your teammates, but you could actually have real stand-offs and fire fights with the leaning system.
gears of war comes to mind in terms of mobility and being able to utilize cover. but in these other FPS, you can barely utilize cover and mobility is honestly at a minimum, other than going prone and the black ops dive, it feels like lateral golden eye movement.
i'm a fan of Ghost Recon, hopefully i can pick that up soon.