This is a summary of reasons why you should still use Ruby:
It is a language with a terrific community (welcoming and always questioning itself) and ecosystem (a lot of problems already solved), which is beautiful (focus on productivity), a little conservative (in the sense that it is easy to work with), and general purpose (a good choice in most cases).
For a deeper understanding of Ruby's principles, reading matz is highly recommended:
The Philosophy Behind Ruby
- Essay: Treating Code As an Essay (excerpt)
- Interview: The Philosophy of Ruby
- Talk: The 0.8 True Language