As for SEUSSICAL the MUSICAL, it's a pure charm show. Delightful music, imaginative costumes, reed-thin story that requires some overly expressive character acting to achieve its goals. With community theater, of course, you don't always get that in every role and thus the show has peaks and valleys.
I also think it's lacking in real humor to keep adults fully engaged, too. As I said, loaded with charm and some invention, but the humor that's present is of the mild sort perfect for Dr. Seuss but not something that's going to go over big for a long run.