I have watched many videos and saw how over the top the game is, and so I thought it would be a run and gun at "Bring Them On (Normal)" difficulty. Guess what, if you don't use cover at all, enemies will adjust their aim very quickly, and you will die soon afterwards. Fortunately, there are almost always alternate paths that allow the player to avoid the most difficult encounters.
It is hilarious that I still have muscle memory from this game, 1 for pistol, 2 for rifle etc. Anyway I had a blast treating this game almost like run-n-gun; knowing where every enemy is on Easy difficulty, it's not too hard. The game is showing its age especially through its AI --- it's a hypersensitive aimbot, and sometimes it's frustrating how easily alerted it is. But if you are able to look past that, then blast away