The EVF is giving the same info as an LCD screen. They don't give you whether you shot for the proper exposure or whether you are getting motion blur. The only thing I can seen in an LCD or color EVF is whether the white balance is about right, but that's pretty much it.
I would like to see a section in the digital camera reviews to narrow by cameras that have Electronic View Finders (EVF). I currently shoot with the Sony DHC-H50 and I love the 100% view and being able to adjust setting and see them without having to both take a test shot and then having to look down at the LCD screen to preview your settings. I am looking to upgrade to a Interchangeable lens camera that features EVF but I can't really compare them because there isn't an option to narrow to cameras with the EVF feature. If there is a way to do this that I am missing please enlighten me!