He has some valid points, but I think a more accurate title is: "Why I don't like Ruby"

"Migration to Ruby 1.9/2.0"

Won't python dev's have the same problem with Python 3000?

"Performance (or lack of)"

JRuby and Ruby 1.9/2.0 already address this issue

"Scoping" "There’s more than one way to do it"

I don't see this as a weakness. This is more about style and preference, though I admit I like Python's philosophy better (Ruby code just looks more beautiful to me)

overall I still think it's well written criticism (at times I cringe looking at the horrible stuff people in the ruby community write)