Q: What about DI, enterprisey stuff?
A: Jamis Buck - "Recovering from Enterprise: how to embrace Ruby's idioms and say goodbye to bad habits" (http://weblog.jamisbuck.org/2008/11/9/legos-play-doh-and-programming). "Code Just in Time, not Just in Case"
Q: What about performance, it sucks?
A: Ruby 1.9 YARV; JRuby
Q: What about concurrency, where are the native threads?
Q: Does Rails scale?