1. While the complaints about error stack traces and documentation are valid, I would personally use a language for a month or two before publicly publicly criticizing it.
2. If you want to learn Clojure and/or Scala, I think that it is worth taking an initial detour and learn a little Haskell. Every time I spend a few evenings studying Haskell I feel like I understand Clojure and Scala a bit better.
3. I think that tool support is very good. I must admit mostly using IntelliJ with the Clojure plugin, but I also use Emacs+Slime for several hours a week.
4. There are many awesome projects and frameworks written in Clojure - to me this is the clearest indication that Clojure is an important language and deserves careful consideration for new projects.