Shortly after ios7 was released, I upgraded, and my first reaction was exactly what most people have already said: the color scheme is all wrong and hard on the eyes. I was one of the people posting here and complaining. My opinion on that has grown less harsh over time, to the point that--with the exception of a few places where I wish I could set preferences for colors (notably the message threads)--I've come to like the color scheme overall. The new version gives ios a fresh face, the new Control Panel is excellent, and Apple Radio, is a nice addition.
To be of some help, I can pass along several suggestions that others here have already offered and which helped me. Under Settings>General>Accessibility, you can turn on both Bold Text and Increase Contrast. Also, if you're one of those bothered by the motion when you open and close apps, you can turn on Reduce Motion .I happen to like the special effect, but some people say it makes them dizzy.
So, I've become accustomed to the new look, and I like it. Give it a chance and maybe you will, too.