Since i was puzzled by the negative comments i went to install it on a virtual machine (here is procedure and links for those who want to do it
How to install the Windows 10 Technical Preview in VMWare Player).
Due to time constraints i won't be long but my opinion is as follows:
A) The whole experience is "simplified".
B) Things are where you expect to find them out of the box, like in the old W7
C) The Start menu works for me. It has all the traditional items AND the chance to add tiles for the most used apps or for weather etc. Personally i'd add an option to make the tiled section STICKY and more customizable (alphabetic order for apps, grouping etc.). I'd call it "Pseudo-ModernUI mode". This will allow users who are unhappy about the traditional environment to still operate within the modern UI in a way. Anyway on hybrids and tablets that environment will be present. I don't like the fact that i can't add my own links in the start menu (they are now tiles though and it works fine for me).
D) It's fast also on a VM. Very fast, very efficient and, to date, flawless. Everything works including Microsoft Updates (already got two).
E) You can customize the start menu color and i find it very nice.
F) No more double interface, double menus, double anything. You work in ONE interface with a bit of "Modern taste". No charms as promised. Touch interface is fast, very fast and very accurate. In short, it could be a beta too and people could use it (although many would be complaining for the missing options i don't see after just a few hours of usage)
Below some pics for those who are curious:
EDIT:
Digging more into articles i found out the Metro UI is there in full (Article here:
http://www.windowscentral.com/get-back-modern-start-screen-windows-10)
Here it is. You just need to change the options in the navigation menu.
Honestly, can't imagine anything more flexible than this. And this is just a preview.
I have suggested Microsoft some changes/optimizations through the dedicated channel. I'd recommend anyone willing to rant to also go rant there so there are higher chances that rants turn into something constructive out of the box.
I have also suggested to allow for some tiles/widgets (News apps, weather, calendar, and a few others) to be addable as widgets on the desktop. This is because i may like or need to have multiple timezones showing in a comfortable place (I use a third party app at the moment and i am not fond of third party apps).
What do you think? I am genuinely curious!