I think the prevailing problem people have with Rails is there narrow definition of a "Rails app" and a very wide space for "what my app will look like in a year".
Yes, this - in my experience, most web apps start out as "good Rails apps", but few remain so indefinitely. Many people over the years of Rails' popularity have experienced the transition from feeling supported by the "Rails Way" to feeling like they're fighting it, and it isn't surprising that this burns people out eventually.
