I guess it depends how you measure success....Using actual, objective information. I challenge you to prove otherwise.
Sure, it's easy. Whatever the program did 20, 30, 50 or 100 years ago is irrelevant. What matters is where the program was when he took over --that's where you start to measure.
In the 4 years prior to Weber, Illinois had
at worst, a 4 seed. And he inherited an incredible roster which went S16, then National runner up, followed by a clear line of worse results as the program turned over. Without Deron, they were worse, and without James and Dee, worse still. Without his inherited stars, his results are:
Made tourney, lost in the first round
Missed the tourney and didn't get an NIT invite
Made tourney, lost in the first round
Missed the tourney, made NIT
Made the tourney, won one game
Missed the tourney in spectacular fashion, losing all but 2 of his last 13 games, after being ranked in the early season non-conf.
That's a staggering turn-around for a program that was consistently seeded as S16 or better when he arrived. The fact that he had such a similar arc at KSU makes it all the more amazing that people try to deny the connection.
If you like those results, that's fine. Or if you like Weber as a coach despite the results, that's fine too. What puzzles me is how there are still people that argue there's no difference between what he took over, and where he left it. I'd think a blind man could see it.