Seems like you could make the same argument about modern C++ or other kitchen sink languages - lots of features, lots of ways to write unreadable code.

I've worked in Scala for the last 3 years and I've found implicits to be the biggest issue. They're hard to debug, it's not easy to tell which implicits are in scope. Things like that.

Being clever is a problem with the developer and not the language. Scala code is dense, sure, but that's not inherently a bad thing.