To me what the article is highlighting is a certain blindness on the part of many Ruby coders. My first language of choice is Ruby, so I'm not trying to spread hate here.
That said, I've encountered many times where a Rubyists first reaction to anything Java is "oh that's terrible" but anything implemented in Ruby must be beautiful, just because it's Ruby. Clearly, that is not true and yet people believe it over and over again.
Also, if you look at a lot of the developments in the Rails world over the past few years, they've been running into problems long solved in the Java world, but only now have Ruby projects been getting big enough to warrant general purpose solutions.
A perfect example is Bundler. It's basically Maven for Java, but it took the community a while to realize "hey, managing libraries is a pain, we need a tool for it".
So as Rails grows up, hopefully it won't forget that many other communities have solved similar problems before it.
Sometimes it's almost as if Rails invented the Internet. :)
But it's certainly true that sloppy code can be produced in any language.