I don't see what the big deal is, hitting the Start key on the keyboard is a lot quicker and if you insist on using the mouse you could just click in the bottom left corner to open the start screen anyway. It looks like it's won Microsoft some brownie points though so I guess it's done the job.
It's always the same pattern with Microsoft, they release a new operating system with a new design (Vista, 8) and everyone hates it but love the almost identical but slightly improved version that follows (7, 9?). I feel a bit sorry for them really.