I like the RTS / turn based analogy.
In US football, the blockers block the assigned player, the runners run the assigned course, the catchers too... really the only thinking head is the QB, it's an army under the comand of a general.
In soccer, there are plays and tactics too, but they are not as strategic... however, the courses are decided by the players, the positioning too. You can have a playmaker, but he has to watch the game, not rely on what is planned. Soccer requiers actual thinking.
Saying your godly QB can think 4 moves ahead just shows how scripted US football is, there is a lack of individuality for the players.
Soccer cannot be done this way, a team only runs well when you have players that thinks and analyse the filed every second.
The other difference is that besides for the QB, what makes the quality of a football player is his physical ability... in soccer, there are many examples of physically lacking people that can compensate with skill and quick minds... and these have one of the most enjoyable football to watch (think small argentinian men....).
In any case, having played extensively US football, rugby and soccer, I can tell you that although it's fun to crush a guy with sheer physical strengh or catching a perfect pass, it's much more satisfying to be part of a well oiled play that just came from the quick thinking of 3-4 players. (one could argue that rugby can fit this description as well). Now if you're a QB yourself, then I can understand that you prefer US Football... you're the star and the one that decides, it's fun.