Here's the thing - I think Cuonzo is a good guy, from all accounts his players loved him. But like most others stated, he is a mediocre to slightly above average coach. He'd be a good coach for a program that isn't historically good and could help stabilize the program and maybe get a couple tourney invites here and there.
He's been to three NCAA tournaments in twelve seasons as a HC. One regular season title, two other top three finishes, nine seasons of finishing fourth or worse.
As people have also mentioned, it was incredibly frustrating to see talented rosters come nowhere near close to their potential -
Those 2012-13 and 2013-14 Tennessee teams had three NBA players (Richardson, McRae, Stokes), solid CBB players in Maymon, Barton, Hubbs and Moore and all we got out of it was barely sneaking into the tournament (I believe the 5th to last team in the tournament) and while you can't control your draw, after the first four game against a pretty solid Iowa team, we got incredibly lucky getting to play a UMASS team that has been viewed as a ridiculously overseeded team in recent history and Mercer to a S16. The most frustrating part is that when this team clicked, they were soooo impressive and dang near impossible to beat, however, they consistently didn't play this way or show the effort. Heck, that S16 team was 15-11 at one point!
His Cal teams may have been a bigger indictment. His second Cal team had four draft picks, including Jaylen Brown who went #3 overall along with (Ty Wallace, Jabari Bird, Ivan Rabb (consensus top 10 recruit). This team also included Jordan Matthews who had a very solid college career. What did it get them? A tie for 3rd place in the Pac12 and a first round exit in the tournament. His other teams at Cal were no slouches talent wise either and they didn't sniff the NCAA tournament.
And then for those saying, "well he was a good defensive coach" - actually, he was not really any better or worse than Barnes or Pearl - Pearl was more consistent and Barnes has had more elite defenses. We just think that because Cuonzo brought a slower, Big Ten style of basketball to the SEC. For reference below are the adjusted defense efficiency ratings for these three coaches over the years, I included Tyndall as well for curiosity. (Adjusted by accounting for opponents, tempo, points per possession, etc).
Pearl (starting in 2008 since I don't have the data prior): 24th, 72nd, 16th, and 39th
Martin: 37th, 102nd (this season also includes those infamous Virginia and Georgetown games), and 17th
Tyndall: 146th lol
Barnes: 141st, 50th, 6th, 42nd, 57th, currently 3rd this season.