Haven't seen it yet. I liked the cheese factor of Genisys. They could have left it at that.
Personal opinion: They were never gonna live up to the future that T1, T2, and T3 depict. It's almost the same issue/challenge that the Matrix movies run up against. No amount of plot writing can escape the usual pit falls that occur when depicting some "Super AI" because a bunch of disorganized humans getting slaughtered by super machines doesn't make for exciting writing unless something unrealistic occurs to even things up.
Besides, the key driving element of the first three movies is the mystery around John Connor becoming that unnatural balancing force in the future. Trying to depict that future kinda ruins everything. We never know why Connor is such an excellent leader. It's better off left that way.
If they want to make new Terminator movies, they should prepare to retcon the entire story. Just get it over with and go even further back in time or something. From even further into the future, send an army. lol