I second this. I use sintra for all those sites that are 75% static pages and few dynamic parts here are there and could not be happier.

Non optionated means that I can really easily setup the model that I want/need without having any framework in my way. Love it. One caveat: I am a senior engineer 7+ years of experience. I would not have been comfortable having to do those design choices earlier in my career and Rails would have been better suited then.