Okay, that's the short answer. I get that a lot of people wanted a "start menu", but why take away the Start Screen and replace it with the box next to the menu ??
Granted, it didn't take me long to sort out how to add / remove tiles from it, but now I'm back to two clicks (at least) to open a program. I'm an old man. I feel overworked when I have to click more than once.
I want my Start Screen back, dog gone it.
Other than that, I'll reserve judgment / rants / opinions for down the road when I've had a chance to torture test it a bit.