This is not new (ask Gallileo) but it is new for the U.S.
I think we're just fucked.
As to your other claims -- no -- MS asked Google to BUILD a youtube app. Google said no,
(1) Notwithstanding the provisions of subsection (a)(1)(A), a person who has lawfully obtained the right to use a copy of a computer program may circumvent a technological measure that effectively controls access to a particular portion of that program for the sole purpose of identifying and analyzing those elements of the program that are necessary to achieve interoperability of an independently created computer program with other programs, and that have not previously been readily available to the person engaging in the circumvention, to the extent any such acts of identification and analysis do not constitute infringement under this title.
"For the sole purpose" meaning only, as in only to allow my software to talk to that section of that other persons software -- this isn't MS unwinding an API to find a way to make its API work with that API -- they're just scraping content. They also have to have "lawfully obtained the right to use a copy of a computer program" and are thus restricted by the terms of that licensed use -- the terms of service -- which here make clear that it is unlawful to scrape content in the way MS is doing -- and therefore it falls out of the DMCA exception.
Regarding the adblocking, this is no different then using an adblocker in a browser when visiting a website, AFAIK that's legal (and if isn't it definately should be)
It is a breach of the TOS -- that means it is a breach of contract. There are also DMCA ramifications. That said, very few websites enforce it that way.
Microsoft is by no means "right."
For everything else, just hit start and start typing what you're looking for -- it pops up.
Now -- I don't think it's "better" than the start button (which did all of that without a full-screen interface that blocks my view of open docs, etc) but it's not all that bad.
The trade off is that the rest of the OS makes a bit more sense -- the interface is cleaner (less clutter around the window edge), file and print sharing is more stream-lined, etc. I have no idea what the charm bar is for, I think it should go away. But overall -- it's a standard windows experience - slightly annoying but it gets the job done. I have to go back and forth from Win7 (at work and on my desktop at home) and Win8 on my laptop -- not really enough of a difference to notice 9 times out of 10.