Perhaps it's because FUD drives involvement by creating division. Humans seem to love to disagree so building up an article based on random unprovable opinions usually gets people riled up and responding. It's link bait, essentially.

I haven't used node.js yet, so I can't speak for or against it. If I find a use for it I'll probably give it a try. If it doesn't feel right I can always use EventMachine in Ruby, use Erlang, Python or whatever else makes sense.