Danny has been a top tier GM.
I don't think we should dismiss the OP's primary concern, though. I think it's an interesting question: is Danny too cautious lately?
There's the DMC debate, obviously. He passed on Giannis in the draft. Are those indicative of a GM being too risk averse? We've seen this from Danny at least once before, when he took JR Giddens because he was presumed to be more NBA-ready than guys like DeAndre Jordan.
There's a concern that Danny could hold on to our "assets" too long. Look at Philly: they dealt Noel for basically a couple of second rounders, and they can't get a decent first rounder for a recent #2 pick in the draft. Could that be us? A good percentage of even top-4 picks are busts. If Danny misses, should there be criticism for not cashing in for a sure thing?
Remember, in 2007 Danny and the franchise were facing a crossroads. Pierce was threatening to leave. Danny talked publicly about potentially trading our pick, even if it was Oden or Durant. He definitely was in "championship or bust" mode.
Has he become cautious? If so, is that a bad thing? Remember, "hungry" Danny brought us a title, but he also may have traded the Durant pick.