As much as I really hate the Ruby magic, I have to say, it's always about doing the right thing, at the right time, for the right purpose. Even more on the kind of magic Rails use.

I personally can't handle it. It's completely frustrating. Nothings documents what your system is doing, and nobody on the community seems to have an inch of clue about what exactly is happening on their computers. But you can't deny that it works, and works well... unless you need to override something due to a niche use-case.