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actually shenan you work for MS as an MVP so your responses are just slightly biased. I have been a MS user since windows 1.0. I actually worked with the company that took MS public. I would say this win10 environment gets a C and the upgrade process gets a D+. I'm sure people will chime in, as they always do, interpreting my criticism as some type of attack where they need to defend this techno-giant. Sometimes you just need to listen to criticism in order to improve product... Not as a personal slight that requires some champion to rescue a cause.
I use a system with an Intel 7 multicore processor, 24 gigs of ram and and SSD as a boot drive. I did not notice a stich of performance improvement going from win 7 to win 10, rather I did noticed degradation in the speed of windows loading and applications loading. This is one of the major reasons for upgrades in the past, ie. improved performance, quicker boot times, improved productivity, better memory management. None of this was apparent to me like the move from Win 3.1 to win98 or win7. These environments had a wow factor for users after boot up. What I do see here is Microsoft's strategy to unify a platform between phones, pc's and tablets. Admirable goals. My 6 other systems will likely not see Win10 which is not what microsoft wants to hear. Most of my friends who have been users of MS are of the same opinion as myself.
As for interfaces, it's better than 8, the start button works well but the requirement of using my hotmail/windows credentials to use Cortana is out the window with me. I tried cortana for a couple of days and it just appeared as another internet search engine. Requiring that I use my ms credentials I view as a potential security risk so cortana is gone. I suspect MS can decouple the login to the Microsoft account as a requirement for cortana but for now, it's gone. Edge does not work with all apps so I switched my browser to chrome. My mouse has become more choppy than in 7 which tells me there may be some processing issues. What I really didn't like was the removal of my games from win 7. This, in my opinion was completely unnecessary and hurtful to the user experience. For those of us who play games like free cell or solitaire or hearts they are not just games. They are pastimes. We tend to keep track of our scores and use these games to bide time while waiting for tech support responses. People really get attached to this stuff. If you peruse the web for "what happened to my win 7 games after update to win 10" you'll find out just how ticked people are with this move.