We only had good offenses when we had a lot of NFL talent on that side of the ball. As soon as those guys graduated, we went back to the cellar. His offenses were terrible after the special 07 class graduated.
Actually, Jokers 2010 team (31.2 ppg) only averaged 0.4 PPG less than Hal Mumme's second highest output (31.6 ppg) @ UK. Also, Joker's 2007 offense actually topped Mumme's highest output with Tim Couch & Craig Yeast. Really, Joker's Offenses overall were as productive as Mumme's overall & the PPG stats bare it out. Both had some ups when the talent was high & downs when the talent was lacking.
However, you are correct that the only good offenses that UK has had (with maybe the only exception being 2014 Brown @ 29.2 PPG) during the past 25 years or longer, did feature a lot of talent. But, when UK does not have top level O talent, EVERY O scheme/OC has struggled... including Mumme, Pease, Joker, Brown, etc.
I have zero doubt that improved recruiting and a mature roster are the biggest keys to Kentucky having a good offense. Again, the stats bare it out.