As far as I can tell, saying "Nginx sucks at SSL" is actually not debatable and is indeed just plain wrong. Yes, the default SSL config uses a cipher that is, relatively speaking, more computationally expensive than others. That doesn't mean Nginx "sucks at SSL." Don't like the default cipher? Great -- change it.
I found the posts to be informative, but I get the impression that the "Nginx sucks at SSL" linkbait headline is what's rubbing folks the wrong way.
The result was his digging into it to figure out the default config included a computationally expensive setup.
That's a debatable thing. Not necessarily wrong.