A lot of the HN crowd dislikes PHP, and can point to dozens of reasons why: no consistency in the standard library re: naming conventions, order of arguments, etc; poor abstractions; up until recent versions, a lack of namespaces or late static binding, and so forth.

A lot of the HN crowd seems to dislike Rails, but I've never once seen someone post a objective reason why. Philosophical differences I can see -- maybe Rails isn't for everyone. But the majority of the anti-Rails posts are FUD at worst, and misinformed at best.