There are very few great Xs and Os coaches in college sports. College sports is more about the talent you have (recruiting) than out-scheming opponents. There's a quote from Roy Williams, maybe apocryphal, where he said something to the effect of "I work so hard recruiting kids so I don't have to outcoach anybody."
Since the 09-10 season (9 full seasons), Cal has made the Elite Eight 6 times with one title. Coach K has made it 4 times with 2 titles, Bill Self has made it 5 times with zero titles, Roy Williams has made it 4 times with a title. Among his fellow blue blood coaches, his record is Kentucky is only surpassed by Coach K in terms of titles, and he's actually made more deep runs in the tourney than any other blue blood coach has since 09-10.
Cal is a very polarizing figure and simultaneously overrated and underrated. It does "feel" like Cal should have more than just a single title at Kentucky. However, Self has zero titles at Kansas and Roy Williams has just one title at UNC over the same period. A lot of Kentucky fans will say "But Cal's job is so hard because he has to rebuild the team every year." That's an intentional decision on Cal's part - he shouldn't get credit for working through any adversity that causes. Many other top coaches deal with the same adversity. However, a lot of Cal haters try to say he's clearly behind most other top coaches in some regard, and he just isn't, at least in terms of NCAAT performance.
If you want to talk overrated CBB coaches, I think it is easier to make that argument about Bill Self or Jim Boeheim.