John Beilein has made the championship game and the elite 8 three times and put several unheralded (relatively) recruits into the NBA. Thad Matta has made the final 4 and the elite 8 three times and put recruits in the NBA. Matt Painter has made 2 sweet 16s and put several recruits in the NBA.
John Groce has put 0 players in the NBA, is under .500 in the big ten over 5 years, and reached the sweet 16 once by upsetting Michigan then beating a 12 seed. He also has more 20+ point losses in 4.5 years than Illinois has had in the last 30+ years as a basketball program.
As much as I like Groce as a person and want to see him succeed, I don't think anybody can legitimately disagree with this very well written, brief assessment.
This summary is hard to read as an Illini basketball fan. I still hope Groce succeeds. But if he does I just don't see it happening as an illini HC.