I liked "The Producers" musical much better than YF, however, I did enjoy YF. I think the criticism has been harsh and not deserving.
I saw "The Producers" with Nathan and Matthew and it was by far, the best musical comedy I have ever seen. The jokes were sharp, singing and dancing great and the famous chemistry between Nathan and Matthew, especially the ad-libbing, was second to none. After they left, the show held it's own, not as good, but as good as anything on Broadway now. I don't think YF can say the same, but worth seeing at least once.
I used to like YF, the original movie, but the last two times I've seen it, it doesn't seem funny to me anymore. I never liked the original Producers movie, which is why I was so suprised that I loved the musical so much. I guess as you get older, your taste changes.
The only review of a show that matters is your own.