Come on now, speed & defense will help you as much in soccer as it does in football; it's a big part of it, but no matter what Al Davis keeps telling you, it's not the only thing. Good soccer is all about ball control (!!), positioning & passing. No matter how fast you are, if you have no control over the ball, you suck. And it takes years & years of training to perfect this. Check out these FANTASTIC pieces of skill in the videos below.
http://www.youtube.com/watch?v=MPzgP6Is3H8
http://www.youtube.com/watch?v=neJ0PTHa2i0
http://www.youtube.com/watch?v=Vz5VL3mcso4
I don't care if you like soccer or not, anyone who likes sports has got to admire the beauty of this.