The sets and puppets hold up to Jim Henson's quality. The story is a bit of a reboot and it doesn't seem like the writers watched the original movie this show is supposed to be based on in 30 years.
They didn't write properly for Chamberlain. They made him speak like a cartoon caveman instead of using his established speach pattern. It's inconsistent. Sometimes he seems incapable of using pronouns, other times he uses them.
In the introduction and first few episodes they changed the basic premise of the crystal.