Rails is (and has been) a pleasure to use for fast, easy-ish development if you usually stick to the "Rails style" recommend naming schemes, etc.

If you are trying to adapt an existing project/db that uses some other style, Rails might not be the best tool to use. When you have to supply explicit table/key/route name overrides to everything, you loose a lot of the benefit of using Rails (or any other very-opinionated tool). I loved using rails for multiple projects, but it's worth making sure it's actually a good fit for the project before jumping in.