I felt compelled to post this here as a counterargument to some of my own criticisms of windows 10 because I myself found it rather insightful.. the below writings are not mine, taken from another forum... maybe people here can pick this post apart and let me know what's in error.
"Bloated? It's the least-bloated Windows OS ever. They've paired down the OS calls by THOUSANDS.
Tile crap - You don't have to use it. You CAN revert to the really clumsy windows 95 style interface. I think you'll love it more if you enable full screen tiles, which is an amazing interface (Metro FTW).
I.E. is a problem, but 11 is mostly compatible with things and I expect edge to gradually come into compliance. 11 now passes something like 98% of the ACID test, which is better than some other 3rd party browsers and MUCH better on memory than chrome.
50% screen toolbars? That's just a lie. My desktops are extremely clean and manageable compared to iOS, the metro toolbars on tablet and phone are constantly ranked ahead of iOS and Android (which, BTW use 95% of the screen for their menus).
The reporting / snooping. All this can be disabled 100%.
Do yourself a favor, download Fiddler (or any packet sniffer of your choice) and then open Chrome. Be prepared: Chrome is MASSIVELY spying on you with CONSTANT packets back to home-office, makes windows 10 look like a piker in comparison. Remember, chrome doesn't allow you to block this but windows does.
Oh and try and do packet sniffing / inspection in iOS...that crappy O.S. hides tons of stuff from you. Heck, you can't even access ring 0 code in iOS as a developer. That makes me laugh as it means all those metronomes musicians use are constantly drifting and having to be corrected for. Don't even get me started on iOS's complete shit of a threading model.
Those Android phones? CONSTANTLY ranging beacons, routers, GPS and reporting your location and status back to various servers, even "peer sharing" information with nearby phones. Running in a VM on top of a crap Linux build means degraded performance, which we're constantly seeing in older model Android phones...they use 30% of their processing power running the underlying host OS and the VM...which achieves NOTHING.
Windows 10 is very fast, lightweight and flexible. The menu is extremely flexible and fast (although I prefer the full metro menu, as it's far less a compromise).
Continuum is looking very strong and the Surface pro 4 is a dream of a tablet, destroying iOS and Android tables at every level of usability and performance.
You're biggest gripe seems to be METRO. Metro takes some time to get used to but once it sinks in, it's the best UIX I've ever used. I HATE going over to a XP or 7 machine or (God forbid)iOS / Android.
Source: I'm a coder, working in the .NET / CE and Java / Android and have worked as an Apple programmer (old school, 6502 stuff).
Oh and Cortana, once you train it, is very useful...like it a lot better than Siri."