I just watched his story about making Cop Out again today. For as honest as he comes off, you know he's gotta be holding back his real feelings about Willis.
There are two things I really respect about Kevin Smith:
1) He's probably the most honest person in Hollywood. Every time he has a camera in his face or a mic in his hand, he doesn't bullshit around.
and 2) Even though he is VERY honest, he also has respect for other people. Just listen to his podcast "Hollywood Babble-on". Every time Ralph is tearing somebody apart, Kevin usually has nothing to add, and he often makes fun of how angry Ralph gets.
I admit I don't know the guy personally, but he just comes off as very easy going. Not that he's a pushover or anything, because he has talked very publicly about his negative experiences directing Linda Fiorentino, Bruce Willis, Jeremy London, but he never goes too far. He knows when to pull back the reins.