The real score is 7.5 because it's the average between the two.
I also watched the whole series so I'l explain briefly (for real) why this isn't perfectly good but at the same time why it isn't so utterly awful.
- So why it isn't that great for many of us?
It didn't have much plotwists. Plotwists are the very essence of an amazing story but this was just a bunch of adults fighting each other, I get it. They could have done better and some dialogs were too plain an obvious.
- It's not that horrible, because the animation was nice to watch, the CGI was great and it had solid action scenes PLUS women were extremely overwhelming in this one, you can't deny that. Did you realise that there are "revelation" scenes after most of the endings? Also, the OST was beautiful and well put and edited, that gets a point from me just for that.
They left an open ending... Yes.