well i took a look at the draft since 1995....and i think i counted 40 players have been drafter straight out of high school 1st or 2nd round.
17 of them are superstars (good to great players...like Kendrick perkins is good so i counted him)
9 of them were good for a year or two, but remain in the league as role players off the bench (eddy curry, amir johnson, deshawn st)
14 of them are busts. this could mean from out of the league to barely getting off the bench (kwame, webster, diop etc)
so 17 out of 40 are legit stars in the NBA. that's not bad. considering how many players in the first round from college arent even in the league anymore.
im not sure of how many high school players declare for the draft and go un-drafted.