I'm in the same boat as a lot of you. I'm using Classic Shell right now. I thought numerous times about give a serious go at the Metro start screen, but I really don't see the point.
My main problem with W8 is the way a lot of the functionalities are either missing in Metro, or are actually duplicated in Metro/Desktop for no good reason. People would then say: "well, uninstall all Metro apps, or modify the file associations so that everything opens in desktop mode, and use the Metro start screen!" That's fair enough, but the question remains at that point: why? What's the big advantage that the start screen brings over the start menu? There doesn't really seem to be any. Some people like its looks better, but that's entirely subjective. Some people like the fact that it's full screen, whereas some people prefer the start menu for the very reason that it isn't full screen. Arguments can be made either way, but at the end of the day, most differences seem to be cosmetic only. Most people are not going to learn a different interface unless there is a benefit in doing so. Also, that's ignoring the fact that we're only talking about using the start screen as a replacement of the start menu. That is not how Windows 8 ships by default. By default, it has all the annoyances of duplicate applications and missing functionalities.
Moral is: keep using a start menu replacement and enjoy the core of Windows 8, where the real improvements of 7 were made. ^_^