You are right, very mixed results.
You have to consider Mike Brey part of it though, and he's fairly done well at Notre Dame, albeit with just one trip to the Sweet 16 (mecca). Amaker was, in my opinion, on the verge of turning it around at Michigan when they fired him, and he's completely changed basketball at Harvard. Johnny Dawkins has Stanford moving in the right direction in his fourth year. Johnson didn't leave him much to work with after the Lopez twins graduated. He did have Landry Fields, but it's take a couple of years to begin getting more talent into the program. They're in New York for the NIT semis right now. David Henderson, who was a teammate of Amaker, Dawkins and Jay Bilas back in the mid-80s, was the least successful. He followed Brey at Delaware and got fired a few years later. Quin Snyder was the most controversial. He did OK at Missouri, but was stuck in the middle of the conference and got fired midway through his last year. There was NCAA smoke but I don't think much ever came of it. The only other one I can think of is Jeff Capel. He started as a young guy at VCU and parlayed that into the Oklahoma job. He looked like a great coach when he had Blake Griffin, then when Griffin left, he bottomed out and got fired. He's back at Duke as an assistant now.