Are we seriously going to have this argument? This is Hacker News, where most of us don't play the Ford/Chevy game with programming languages. Most of us have used multiple languages and know exactly when to employ the right tool for the job.
Perhaps we should have a new rule: if you haven't built a full-scale web app in a specific language, we'd prefer you not comment on it.
(Every week I hear about some new asynchronous web server written in Python. Do people really want to spend time working on their own problems, or do they just want to type as much code into the computer as possible?)
All I'm saying that evaluating every research language out there and seeing how well it suits your problem would just take too much time. Getting acquainted with a few well-known languages and a few DSLs or cult-followed languages should be sufficient.
Perhaps we should have a new rule: if you haven't built a full-scale web app in a specific language, we'd prefer you not comment on it.