I also chuckled when reading this very post, but some of the others seemed more or less reasonable. The site is useful, because it turns to the opposite side of the goodness of the ruby world and does it with ironically emotional charge. I liked it.
I left twitter out because it has started departing a bit from pure Ruby on Rails and has had scaling issues from the get go so isn't a really good example when someone is bitching about the abilities of RoR.
"Show me one example of a corporate or high-traffic website that uses Rails other than Basecamp."
-yellowpages.com
-hulu.com
-shopify
-kongregate
-github
-justin.tv
-ravelry
the list is actually pretty large nowadays. I don't even code with rails anymore, but this site is a big heaping pile of whiny bullshit
EDIT: formatting