I haven't looked at CCSS across all grade levels, but I can tell you that in Wisconsin, CCSS is a kick in the rear. As a state, we're about two grade levels behind the level of work that CCSS requires. It's not a dumbing down - it's a ratcheting up, for us.
Frankly, I think it's a good thing. There have ALWAYS been standards in education, at least in Wisconsin. Everything I've taught has always had to adhere to the state standards. CCSS simply replaces those. The methodology is another question entirely, but as far as I know, CCSS doesn't itself require any certain methodology.
Furthermore, from my understanding, the only standards that are "finished" at this point are those for math and language arts. They're still working on social studies and science, but those are due to be rolled out in another year. I think.
It all boils down to this, from my perspective: if you're angry about CCSS, you either don't understand it, or you do understand it and think it's too rigorous.
Again, this is all based off my own DIRECT EXPERIENCE working with these standards, trying to prepare to implement them next year, etc.