Dale:
On the record, few architects are going to say anything negative about their past work. It just opens the door to more criticism. For example, I've been honest that I wish I could make some decisions at Black Forest over again, because I think it was an excellent site and it could have been VERY good ... but all people remember is that I said it wasn't my best work, and it's so rare for an architect to self-critique that people assume it must suck!
Off the record, several architects have told me of projects they didn't like in hindsight, but I won't share those confidences.