Size matters in loads of things, word.. especially sport.
If you had a 5'6", 200lb running back go into a head on collision with a 6'5", 320lb linebacker.. who the fuck do you think is going to come out of it the better?
Or, if you pit a 4ft dwarf against a 7ft giant in a game of 1-on-1.. the chances are the tall dude is gonna own that midget ass.
And, for an english sport as an example: CRICKET. Tall batsmen are quite adept at hitting the high bounces whereas shorter batsmen tend to duck and allow the balls to go over the top of them because they can't get enough power in the swing if they are having to raise the bat up almost over their heads. Just look at Stuart Broad, he shows how easy it is for a tall batsman to hit the high bounces.
Also, the mother of all examples
Taller people tend to have larger feet, and you know what they say about dudes with big feet. Nuff said. And even if it wasn't true, women are all like.. look at the size of his feet, he must be well equipped.. nah'mean.
I myself am a UK size 15 which works out to about a US size 16-17 I think.