Tolkien languages

How do you feel about them?
Which is your favorite?
Which is your least favorite?

I think my favorite has to be Black Speech, and my least favorite is probably Dwarven tongue. I also like Quenya, it reminds me a lot of the Breton language.

If you're going to waste your life learning a constructed language do it with one that has some standing, like Esperanto or Klingon.