What I would say to that is:
1) Denver netted a total of one 1st rounder for Melo. Outside of that, they got a total of four mediocre or above average players and two second rounders. Had Denver gotten 3-4 1sts like what we see today, the way we look back at that trade could be completely different. So to say “multiple picks” is a stretch when 2/3 picks were 2nds.
2) The Deron Williams haul was actually a huge haul at that time. The Jazz got back the 3rd overall pick in that draft, the #3 pick the following year, another 1st, and a young guy who had been an All Star. What the team does with those picks matters too, but the trade itself was a great return. Kanter was obviously the wrong choice.
3) The KG deal got them two 1sts, one of which was used on Jonny Flynn. Had the Wolves drafted Curry, would you still say they got fucked? Getting the package is one thing, having the foresight to actually draft the right players is another.
Now, you’re also looking at trades from over 10 years ago. If you look at recent trades,
1) Jazz got a haul of picks from the Gobert trade.
2) Hawks are going to be regretting the Murray trade for years to come.
3) Nets had to undo their mistake of trading multiple 1sts for Harden by recouping some of them and trading Harden, then got another haul back for KD.