The sport is kind of wacky -- kind of like the early days of triathlon, I guess. The competitors are wannabes in each of the core movements: weak Olympic lifters, clumsy gymnasts, slow sprinters, etc. But they have an all-around versatility.
Compare one of the best competitors at the 2010 CrossFit games, DJ Wickham, with the 2008 Beijing super heavyweight gold medalist, Matthias Steiner.
Wickham just isn't in the same league as Steiner [or weightclass]. But, I bet Wickham runs faster.