I have created 31 new versions of this theme. This includes in it the largest one that is 2353x200, along with it in other sizes, there is a smooth version in various sizes and others have a very light tint of blue.

The one-star thing has little to do with my theme. My display is 1366 x 768 and the theme looks very good. How experienced are you in computers? Full specs would be helpful.
The entire display size, graphics software, hardware and settings, video card and other things.
All of these things do play a part in how any theme looks on your monitor. This is especially true given the complexity of this theme.