This I think has been fixed, but infantry would often run towards the nearest best cover when under fire, often straight towards the enemy position. For example, running towards the woods where the enemy fire was coming from, as there was only clear terrain behind you.
The "gamey" part, if one considers it so, would be where an ambush was set up with full knowledge that, by the time the ambush was sprung, the TacAI would seek the wooded terrain and dash forwards, as opposed to just taking cover or trying to withdraw. This could be construed as using the game engine itself against an opponent. If you are unfortunate enough to have the ambush sprung right at the beginning of a movie, you could be out a squad or two before you can react.