Its kind of ironic that for folks like me that ran screaming away from Java/J2EE to Rails are now seeing questions that assert Ruby/Rails is the new "boring" when it used to be Java. I think this is speaking volumes about the maturity model of the stack and eco-system. For almost any web application you can't go wrong with Rails.

People will knock the performance almost out of habit but there are major internet scale applications out there running this stack. Its horizontally scalable like many other web stacks and I would put developer happiness and ease of use as more important than some theoretical spreadsheet benchmarks.

Many developers just get bored and want to play with something new and shiny. Our industry has spent countless hours reinventing the wheel. I'm not saying there should be one tech stack to rule them all, just that the time spent inventing new frameworks for Resume Driven Development is kinda ridiculous.