My point was simply that these guys are physically gifted to have competed in the dunk contest. Almost all spent 4 yrs in college. College seasoning did not seem to help any of them at becoming better at playing in the NBA.
I wouldn't say they got any worse, maybe none of these players were destined to be NBA all stars out of high school? 4 years of the highest level of college basketball in my opinion can only make a player better, barring injuries. Maybe they just reached their potential?
I think players should be able to enter the draft when they want, but unless they're extremely high level prospects - Dwight Howard, LeBron James, etc. a year of college will only do them good. I think a year of college beats a year on the end of an NBA bench.
That said, you can't discriminate against the lower level prospects, so this would never happen. There could be some kid who isn't a high level prospect but doesn't want to go to college because of a tough financial situation at home - he should be able to enter as well, even if it's not the best decision career-wise.
I think the one year rule is great, it can save alot of high school kids from going late in the second round and never getting a shot, then ending up somehwere in Europe. I'll take better, more NBA ready rookies + better college basketball over allowing big time HS players to come out a year early. We still get to see these kids in college and I think the positives outweigh the negatives with the 19yo rule.