From a pragmatic point of view, Ruby on Rails does generally take less code for web applications than comparable languages and frameworks. This makes it faster,

From a pragmatic point of view, Ruby on Rails does generally take less code for web applications than comparable languages and frameworks. This makes it faster, but only if you know RoR. Other languages and frameworks may not be considered sexy because they take a lot of code to do common functions, aren't concise languages, or don't have an easy or "right" way to do some things. RoR is also sexy because of the ecosystem of plugins (gems) that solve a lot of boilerplate problems. However, I agree with everyone else, choose the right tool for the project.