For me, Scala is a great language that continues to present me with good surprises (i.e. literal curry syntax). The only issue for me is the JVM and the package/namespace system (not to mention mvn, sbt).

In this way, Erlang/Elixir is more enjoyable for me. I much prefer the Erlang module system (Python and Node.js get a special mention here as well) vs. what you get with Ruby, PHP, Java, etc.