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 think your options are mutually exclusive. You could perfectly use MVC while using BLL/DAL for your model logic.

You can implement the M part of MVC as you prefer, there is no restriction about that. Using BLL and DAL would be a valid option.