no they didn't get better. You haven't learned the lesson of regular season vs playoffs
Nuggets made it to the WC finals with Melo. After Melo was traded, the Nuggets had 3 straight 1st round exits then 5 straight years in the lottery. That's not getting better. Further, the year they won 57 games the 3 rotation players they had from the trade were Gallinari (he was 22 when traded), Wilson Chandler (he was 23), and Kosta Koufos (he was 21). So there were the young players, all role players even though Gallo was a good scorer. And they got a 12th pick in a draft 4 years after the trade. And a #9 for #7 swap 2 years after that. Those were the main parts of what came back to Denver and that's a fairly common return
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notice that Chauncey Billups was traded along with Melo. At the time, Billups was averaging 17 points and 5 assists. He was the 2nd best player on that Denver team. So, part of that return Denver got was from adding Billups