Our Pal Mickey is from 2003. We used him last year and also last month after the new Pal Mickey came out. Both times he worked fine. We usually get the same tid-bits of info. as we go through the parks. He'll tell something about attractions or other background facts. He plays the games and tells the jokes, etc.
We were getting some parade and wait time information from him on this most recent trip, but sometimes he was off by an hour or so. We were also curious if there were anything new tid-bits about the new attractions, so we stopped by the Pal Mickey store in the MK and asked if he should be updated or anything. (Dh thought this would probably happen when we entered the parks.) The CM set our Pal Mickey down in a drawer with his nose next to something to re-set his programming or something. We didn't really notice much (if any) difference after that, but he was working.
Maybe you could see if yours needs to be re-programmed like that. If he's just telling jokes and saying "gosh", that doesn't sound right.