I personally feel that the flat theme in Windows 8's desktop mode looks awesome. It consumes less resources than the Aero theme of Windows 7 and all the eye-candy effects like glass, blur and reflection don't matter in a productive environment.
But for the interested people here on Winmatrix, there's petition to ask Microsoft to bring back Aero glass theme in Windows 8. 
You can sign the petition here!
Many millions of people have enjoyed the increased functionality and superb looks offered by the Aero Glass interface in Windows Vista and 7. To remove this feature from the otherwise-good Windows 8 is a real step backwards, especially to those who are not using 8 on a tablet or laptop. Please allow Aero Glass to be an option-as it was in Vista and 7-for those of us who would like to use it.