I know that ads showing the screen with the tiles was what immediately put me off it. If the desktop can look more like W7, then that's OK.
If I reinstalled Windows 10 I would use a third party menu, in fact it would be the same one I use for Windows 8.1 called startisback and yes it is all one word

but that one is not free, but I think it is one of the better start menus. If you want free then Classic shell will work.
that is if MS don't try to stop people using these third party menus.
I suppose appearance is something to get used to, but I don't like how there's always things that need to be ironed out and corrected after people start complaining about things that are clunky or unsafe.
I can understand why MS went for the flat look on both 8.1 and 10 and that is so the OS can run on machines with less graphic power, but it would have been nice to be given a choice. Windows 10 is worse than Windows 8 in that manner. There is software to change the look like Windows blinds, but
(a) it is not free
(b) when I used it with XP years ago it was a resource hog, I know machines are more powerful now.
The main problem is a lot of these bugs and problems MS knew about before windows 10 was launched and yet they still launched it. this is why I say it is still beta and always will be, because they use the excuse of it being a service.
MS must think all of us was born yesterday.
Cortana on a phone was another thing I didn't like seeing in the TV ads. Would certainly dispense with that.
Cortana is disabled as default, but some of the data collection associated with it is still on, like getting to know you. I do not see Cortana being much use on a desktop, very few desktops have microphones unless you have a webcam with one and I am not sure what use it will be anyway unless you are tied into the MS environment.
You can get rid of the search box to either a icon on the task bar or just get rid of it full stop.
On a mobile phone Cortana would be as useful as Siri and Ok Google is and to be honest I think both of them are lacking. The best thing I use OK google for is to ask for the weather and to set a timer when I am baking and a alarm.
Advantages or not, seems we don't get a choice ..after all, we're only the customer
Still, I can sort of see that keeping 2 O/s's updated would be hard for MS!
This we don't have a choice is what MS is looking for, which is why they are pushing Windows 10, Windows 7 will be supported until at least 2020 and Windows 8.1 another 3 years after that.
You could update to Windows 10 and then roll back to your old OS which is what I did, now I can update to Windows 10 even after the update offer ends.
A lot of people think they will extend that anyway as it is not doing as well as MS hoped, even if they keep telling us that Windows 10 is on 200 million devices, they forget to mention that includes Xbox ones, where people do not have a choice.
I will install Windows 10 again if they
(a) stop the forced downloads
(b) stopped the spying
While I am not 100% happy with Windows 8.1 and I still prefer Windows 7, I prefer it to Windows 10.
Adrian
Desktop machine now powered by windows 8 pro 64bit, no dreaded metro and Linux , laptop by Linux
Plusnet FTTC