Seriously, you don't believe that the inclusion/exclusion of the Start button makes/breaks Windows 8, do you?
The weekend I set aside to upgrade my laptop from Win 7 Ultimate to Win 8 Pro, you know what my priority was? To start Monday morning with all my apps up and running! I couldn't care less about touch or the Modern UI or the Start screen; I just wanted to have my apps up and running.
Okay, so the Start button was removed, but that didn't break any of my apps. A lot were already on my Taskbar and others I had to add to get around the missing Start button, but the most important thing was that my apps were running. Not only that, the environment was much more stable and it was a faster and more responsive OS.
Moreover, for the longest while after I successfully completed the upgrade, the only time I'd see the Modern UI/Start screen was briefly at boot or shutdown, because 99.999% of my time was spent in Desktop mode with my Desktop apps. The Desktop apps that were in my Win 7 Startup were also in my Win 8 Startup. As a result, I would boot into Desktop mode automatically. Regardless, the max it would take is one click to get back to the traditional Windows desktop but, as I'm sure is the case with a lot of pre-Win 8 setups, with certain Desktop apps in the Startup, there is no need for the click because you will get automatically booted into Desktop mode. Consequently, I fail to see how that can be considered as Microsoft forcing the Modern UI onto us.
I think Microsoft did a remarkable job implementing the Desktop personality into Windows 8. Once you're in it, with the exception of the missing Start button, it looks, feels and acts just like pre-Windows 8 and you need not continuously or frequently toggle back and forth between Desktop mode and the Modern UI.
Because I was able to fully concentrate on getting my Desktop apps up and running in Windows 8, I was able to leave any "playing around" and learning of the Modern UI to a later point in time. With previous Windows upgrades, after the upgrade, I spent a lot of my immediate time learning about the new OS. When I was fully settled in Desktop mode, that is when I took the time to start to play and learn the Modern UI. Without being forced into the new Windows UI as I was in the past with previous OS upgrades, I was able to start learning Windows 8 and the Modern UI on my own time.