If you want to support Microsoft being able to tell you what you can install and what you cannot install on your computer, then that is your choice.
If you want to give even more information to Microsoft than ever before, that is your choice.
If you like being spied on, that is your choice.
If you like that any and all information, on your computer, can be made available to law enforcement without any type of warrants, then that is your choice.
Windows 7 is bad enough, but 8 takes it all to new levels.
The day is coming where you will not be able to own any applications. You will rent them, paying to use them for a specific time. This is where Microsoft is going and each iteration of the OS, they bring it one step closer to reality. If that is what you want, then by all means, go out and buy Windows 8.
For me, Windows 7 is the last OS I will own from Microsoft. I will not support the direction they are taking. I hope most people will make that same choice.