do you think you would use un-opinionated were rails not known as an 'opinionated' framework? as rails used that term to set itself off against things like spring, have you found un-opinionated to be ever cause confusion?
I've never found that it causes any problems, but since I have been primarily in the .NET world lately, it's pretty rare for people to be all that familiar with anything elsewhere, and if they are, they generally get what I am going for when I say it.