From what I've seen, I can definitely say I am very excited. This is about the same level of excitement I got when details of LoD came out, and if impressions can be trusted, then I do believe RoS will be D3's LoD.
However, it will most certainly not be the peak of D3. I think RoS will make a lot of mistakes. But just as D2 had its 1.10, I think D3 will also have that one defining patch that will make it truly shine.