Yea, the basic enemies on the easiest difficulty levels can just be shot with maximum pew pew. Then you encounter the bug that has a bullet proof headplate and it sticks it down to the ground like a shield when you start shooting - and your bullets will ricochet from it, possibly hitting your teammates if you just go hog wild on it.

Then there are the bigger enemies that have specific weak points - usually on their backs and sides, where you can't shoot but your teammates can when it focuses on you.

And the automatons shoot back, pretty accurately from far away.

The difficulty is pretty dynamic too, there are rules on how it works, but you very rarely get a break in the fighting and on higher difficulties running away is an important skill - you don't get points for shooting every enemy on the map, you just waste limited ammunition.

And then there is the plot with an actual human GM deciding what happens instead of some algorithm combined with nice immersion and a bonkers Starship Troopers-esque (the movie not the book) world.