While on a visit in '03, there seemed to be a possible cultural misunderstanding between one of the "moms" and her customers. I think perhaps some of the visitors to the restaurant did not understand the novelty of the restaurant and as a result, did not take kindly to being treated like a disobedient child.
Went again in '06 and was extremely disappointed. The staff were not into their characters at all. I think our waiter made the occasionaly comment about "dad", but the feeling that you were a kid again and being told to finish your plate was gone, as was the novelty of Prime Time.
I think that perhaps Disney was afraid of possibly offending people and slacked off on the routine a bit. I'm hoping that this has changed and that Prime Time has returned to its former glory.