I'm with Gig and Rothko in the disappointed camp. The writers seemed to be in a big hurry to end this series.And the belief suspension required is off the scales. Gregor with a sword through the head?
And that is not the way I wanted Cersei to die. Something much slower and far more painful. I am assuming she is dead, which may not be the case.
The Mountain is undead. This knife action and the Mountain's state of existence is pure H.P. Lovecraft. Martin is a fan.
Cersei is dead, and not making viewers/readers happy is the way it goes in Martin's world.