As a FPS, this game sucks. You'd have various weapons but most of them require mid-battle conversions. Weapons most often lose certain customizations when they're converted to other types. A lot of actions in the game like switching weapons, looting enemies, etc trigger non-skippable animations. The horizontal FOV is fixed and cannot be modified. The default FOV is short and highly impacts gaming experience if you're used to adjusting FOV. The vehicles in this game are utterly useless. Infact, running feels a lot better than riding a bike.
Overall, combat experience in this game is a joke. This game is not meant for a fast paced combat. The one thing to praise is it's graphics. That's an incentive for utilising CryEngine.