The last decade isn't really relevant. We should only be looking at DL's drafting record.
Trey Burke
Rudy Gobert
Rodney Hood
Trey Lyles
Donovan Mitchell
That's 3 out of 5 and Lyles could still end up being a decent pick, even though I'd call it a fail for passing on Booker when this team desperately needed shooting and the best shooter in that draft fell right in our laps, only to be passed on.
Still, that's 3 excellent picks out of 5 for DL, and twice he got a top 2 player in the draft with picks some people don't value much. Mitchell may very well end up thee best player in his draft class, which is saying something as it's one of the best in years.
Every team in the league would be happy with that kind of draft record. It's really only unrealistic fans who expect a home run with every pick who would question DL's ability to draft well.
Mitchell and Gobert, Burke were never drafted by DL or the Utah Jazz. DL does get credit for trading for them after the Draft, but this is not only obviously rare to improve dramatically with a draft-time trade but also very lucky. Either way, DL deserves extraordinary credit either way.
You left out many many busts throughout the last decade.
2007
Drafted: Morris Almond (amounted to nothing in the NBA)
passed on:
Aaron Brooks, Arron Afflalo, Tiago Splitter, Carl Landry, Marc Gasol
2009
Drafted: Eric Maynor (Out of the NBA within several years)
passed on:
Taj Gibson, Demarre Carrol (it was a weak draft, no doubt about it)
2010
Drafted: Gordon Hayward (obvious draft choice at 9th overall) Credit to DL
2011
Drafted: Enes Kanter & Alec Burks.
Kanter and Novak eventually trade for Pliess, Kendrick Perkins, Grant Jarrett and future Thunder 1st rounder. (Waste of Kanter's value)
passed on ahead of Burkes:
Markeiff and Marcus Morris, Kawhi Leonard, Jimmy Butler, Reggie Jackson, Tobias Harris, Kenneth Faried, Dantes Montejunas, Nikola Mirotic, Isaiah Thomas, among others. (Huge Fail)
2013
Drafted: Shabazz Muhammed
Gorgui Dieng
Erick Green
Passed on, Giannis Antetokounmpo, CJ McCollum, Steven Adams,
The Good, WE GOT GOBERT THROUGH TRADE.
2014
Drafted: Dante Exum (Weak Draft, but probably a bust)
Rodney Hood
Passed on for Exum alone:
Marcus Smart, Julius Randle, Nik Stauskas, Zach Lavine, Gary Harris.
Traded Hood for essentially nothing and passed on:
Jordan Clarkson
2016
Drafted: Taurine Prince
Passed on:
Denzel Valentine
Malik Beasley
Juan Hernangomez
(Weak draft, easy to miss)
We made a couple of great trades to acquire, Mitchell and Gobert, but our draft record speaks for itself.