my reasoning for saying it sucks....off top (no reason to even test it further, IMO)
1. like everyone else said, it's really geared toward touch screens (tablets, phones, touch screen computers) so if you don't have a touch screen, it's awkward as hell to use.
2. as soon as i download a non-microsoft piece of software (google chrome in my case), i get thrown out of the new UI into a "regular" microsoft desktop, WTF!
3. windows 7 was the best thing since XP. it hasn't been out that long, so why mess it up with this BS? MS's track record is that every other OS is good anyway. 7 was good so 8 is a POS.
4. you have to "figure out" how to navigate. you bring up menus by using the corners.....really? i'm an IT person, so i can usually figure shit like this out with no problems. my parents on the other hand will be blowing my phone up asking me how to use this.
i don't think this was well thought out by MS. i think that they saw what apple was doing and decided that they needed something to bridge their phones/tablets/and PCs together like OSX and iOS. the only thing is, their implementation of it was completely off base. i use a mac and home, and xp at work, so i'm comfortable with both, but this shit is just garbage in my opinion.
just to throw in an extra kick at the end, i have a friend who works at MS. he won't even let them install this on his machine at work. he's staying on windows 7.