I am no trainer, and i do not have that much experience, being only 22. but when I was sixteen, I had 220 pounds of weights and a barbell in my basement and a few logs in my back yard. I spent the summer doing power cleans and pushpress and throwing logs. And honestly my program was not that good, and my form was technically not that good, and every now and then I would tweak my shoulder a little, but I got strong as all hell on this program and kicked fucking ass next football season. (I only weighed 180, and was not penciled in as a starter on the line during summer practice, until the first day we went full contact and I threw a lot of fat boy's on their asses). In retrospect, I might do a lot differently (eat more protein, lift more often with better form, and train a little more endurance), but I would definitely keep using the olympic style lifts.
It seems moronic to me to suggest that they do not work or that one needs to use perfect form--if you ever watch pro-football players work out, a lot of times their form is terrible, and yet they get results. If you are training a bunch of athletes, show them the moves, and then tell the really incompetent ones, who mostly will suck at sports anyway, just to go back to doing girl exercises, and practice with a broomstick.
By the way, as far as I know, turning the power clean into something more like a power curl is the most common mistake, but the power curl is itself a good exercise that will build strong arms, delts, back, hips, traps, legs, etc.