The AI doesn't look very smart. I was watching some videos where they just stand in one spot and shoot. They don't even attempt to take cover. Hopefully this isn't the case when the game is released, would be a shame.
It is one oh the things hvs needs to work to improve for possible future games. The enemies seem to do enough evasive maneuvers and can melee in quick succession this time, also they were not suppose to expose themselves if you point at them while they are behind cover, but I haven't seen that happening.
It's possible to use it in a constructive way, but currently it mostly means that the enemies know when to duck and cover. Enemies that are good at these kind of coward tactics are far less amusing to fight then "dumber", more aggressive enemies (which can still be challenging if they come in huge numbers or simply are good at aiming and have enough health.