Do you just run and shoot? How many times did you have to reload at locations with that approach? To reach the fourth location, I had to run, jump, shoot, dodge, figure out how to dodge a bunch of enemies at once, which weapon to choose for those enemies and which for these, quickly switch between them, shoot accurately, anticipate where to shoot a rocket so that those enemies die and not me, and so on.
If that's the case, you can say the same about any game. Heroes? Oh, what's to think about, you gather an army and kill everyone, what a game! Red Alert? You build units, gather resources, and kill everyone, what a game! Guitar Hero? You pluck the strings and that's it, what a game!
Except the ones we've made