I just saw the finale of Grey's Anatomy and?!

I just saw the finale of Grey's Anatomy and?

I was kinda disappointed! In Italy it aired last monday and i just watched it. I mean... why did Burke do that? I seriously didn't see it coming... he didn't even give a reason. As far as Meredith & Derek go... she didn't give him an answer so there may be hope for them but come on... Everyone was sad, everyone was desperate. Who else thinks it was a little disappointing? I'm still looking forward to series 4 though! Actually, I can't wait. All I know is that I already hate Meredith's sister.

Meredith kind of implied that it was over, when Derek looked at her she said something like it's so over, and he just looked heartbroken, she did say she needed Cristina and Burke to make it b/c then everything would be ok.
The Burke thing shocked me, they must have known they were going to fire Issiah Washington. The only good thing about it, was really got to see a different cristina her crying and being hysterical. I hate Mer's sister too, I I think she is going to be a source of a lot of problems.