Why football rocks and soccer sucks ?

It rhymes, and that's enough to make it a fact, the rest is for expanding your knowledge.

Why football rocks ?

You don't have to be very good to play, good is enough.

If you have money you always win.

You are not susceptible to injury in every minute you play, unlike wrestling  and bull riding/running.

If you're overweight, every game requires two goalkeepers and a referee, you can choose.

Why soccer sucks ?

There is no such thing as soccer, and the name is terrible for a sport.