You know a franchise is in a death spiral when it goes into "ignore the prior movie" mode. The Terminator franchise has done that at least twice now.
http://www.ign.com/articles/2017/09/...ignore-genisys
I just watched Genisys a few weeks ago, and I rather liked it. I think it may have lost a few casual viewers with some of the time travel explanations, but it didn't seem too outlandish if you're used to sci-fi. There's only so many ways to explain why a T-800 would look like a man in his sixties, and I think they pulled it off nicely.