Ween is amazing and one of my favorite bands but I agree with you and Pugeye that a few of their most beloved albums are kind of overrated imo, including the Mollusk in my opinion which isn't as consistantly great as it seems. GodweenSatan, The Mollusk and Quebec are not particularly my favorites although I could make a great compilation of songs I love from them still.
My favorites are The Pod, Pure Guava, 12 Golden Country Greats and White Pepper. Pure Guava might be my favorite overall, based on the ####ed up beyond belief and trippy sound, even more than The Pod at times.
La Cucharacha is not bad and and I agree it isn't the all time low people say it is but it is still kind of weak and disappointing. I've come to terms with it being their last album possibly though and there are some good songs on it still.