I agree with everything you said.6/10 I would say.
Middle parts were a let down. It started off well and ended well I thought. I liked Edge/Seth, Cena/Roman and the RAW Women's Triple Threat the most. Overall it was one of the more weaker Summerslam shows I've seen, but certainly nowhere near the worst.
Find it hard to believe that anyone could rate this show less then a 3. It isn't December to disremember levels of bad. But then again people tend to be hyperbolic on trivial matter, which is fair enough.
Especially when it comes to marking something out of ten. Like when you say a girl is a 10 when really she is a 8 at best