Ask HN: What's the most underrated programming language?

Recently I started reading about erlang[1][2], And I started feeling why its not widely popular as python or go. Though I have very little knowledge about functional language and tradeoffs when it comes to using them. Just wanted to know more about it and any other languages which are underrated

[1]blog.whatsapp.com/index.php/2012/01/1-million-is-so-2011/ [2]https://stackoverflow.com/q/2708033/2577465