-_-
There is a certain phrase known as "figure of speech"
Ok fine, let me rephrase what I said, let's say that TF2 requires a little thinking (where to build your sentry, how to get past the enemy team as a spy).
Now let's take a look at Call of Duty. You spawn, you get a gun and you shoot. That's as far as thinking is concerned. It requires hand eye coordination but nothing except that. Thinking in that game goes down to wasd for walk, e for use, r for reload, v to knife, space to jump and mouse to fire. This is it. Or is there something more? Some creativity? A workshop in which people can create their own custom content? Is there?