Reasons not to use MVC architecture for web application

Question

In the past I have primarily built all my web applications using an N-tier architecture, implementing the BLL and DAL layers. Recently, I have started doing some RoR development

Answer 1

I don't use MVC only on really tiny projects consisting of ~1-2 files and ~10-20 lines of code. And they will hardly evolve into something bigger.

But if they will, it will be time to rearchitect them into a MVC ones.