I'm also surprised at the dislike for Groovy. When I looked at it, it seemed to be roughly on par with Python or Ruby, with some nice features unique to Groovy.

I'm also surprised at the dislike for Groovy. When I looked at it, it seemed to be roughly on par with Python or Ruby, with some nice features unique to Groovy. Of course, there's the limitation that it only runs on the JVM. Maybe it suffers from the following thought process: many people who want a rapid development language and would be interested in Python or Ruby aren't interested in running on the JVM, and people who are already in the Java ecosystem are too biased in favor of static typing to give Groovy its fair shake?