Grading trades is a media thing IMO. It's unclear what we are evaluating.
Irving's trade is one any GM would have done, it's a no-brainer really.
Yes, the funniest thing is when the pieces in a trade are picks (or 19 y/o players) that take 4/5 years to be consumed in the first place, without us having a clear idea where they might land, and then they grade it 15 minutes after the trade.
They can't predict how will, for example, Batum fit in Bobcats in 2015, (they didn't predict he will be operating the ball this much and that he will bring much less defensively than offensively) but they are presenting to know how the unknown pick that will select the unknown player to a, by then surely, unknown roster in an unknown league, that was totally different just 4 years ago.
Oh yea, teams can also trade the parts of that trade to make it even more of an unknown.
Ahh, the "experts".
Now, in the Internet era, we can't even wipe our behinds with their articles, to put some use into them.