For a Joker episode, 'Be a Clown' is not bad at all. It captures the Joker's insanity well and gives him a distinct feel of menace, while having a few funny jokes that will either make you chuckle...or cringe.
The Joker's portrayel in this episode will be liked by most, but others will not like the way he is constantly in a very obvious disguise and makes various one-liners that will make people see him as more of a clown and less of a phycho. He is not nearly as bad as in 'The Last Laugh'. In fact he is rather good. But very particular fans will not like him. I personally see the crazy side of him in this, hiding alone in an abandoned theme park with various freaky things lying around, and luring an innocent kid into a life of crime to help him murder Batman. He also tries to blow up the Mayor's house simply because he was compared to Batman on TV by Mayor Hill. Some, however, will not see the evillness behind the clown act and comedic jokes.
I personally think that this is a very good, underrated Batman episode, that may not be quite as good as others like 'Heart of Ice', 'Mad as a Hatter' or 'Two-Face', and it may not be amongst the top Joker episodes like 'Christmas with the Joker', 'Joker's Favour' or 'The Laughing Fish' etc., but this is definately worth a watch or two. 4/5.