Nba 2k8 rookie question?

aight, i know that in nba 2k8 the rookies like Kevin Durant and Greg Oden do good their first seasons,but my question is why do the draftees of the future drafts in the game turn out to be so bad...for example in nba 2k8 you make it to the 2009 draft the first two picks in the draft the following season will only average about 3 ppg ,is there anyway to change that because in reality the first couple picks in the draft usually are way better than that...