It's not actually that bad!
Yeh I know this movie is getting a lot of crap online at the moment, and considering it's currently at 27% for some reason on Rotten Tomatoes I might not be popular for saying this, but I thought it was good.
Not great of course, but still good.
The action was great, there was some funny callbacks (okay a lot of call backs), some great story moments, the future war scenes were cool (they were always my favourite shots of the first three movies and I'm chuffed there's more of them in this one) and Arnold Schwarzenegger was really good in it, even had some touching moments which was surprising. Plus JK Simmons and Matt Smith had a couple of really good scenes that I liked, they were well cast.
And okay so there are a few negatives to the movie too, the plot is a bit weird, the further mucking about with the timeline is getting a little confusing, there are several big questions unanswered that are obviously plot hooks for sequels, the marketing department screwed up big time by revealing several of the big twists in the trailers and ruining the surprise, and for the life of me I can't understand why Jai Courtney keeps getting these important roles (Jason Clarke was also an odd choice, for the life of me I can't figure out why they didn't pick Chris Pine for either role, he can handle the action, the emotional stuff and still be pretty funny).
Still despite all that, like I said, it was a good movie, not the best movie ever made, and definitely not the best Terminator Movie ever, but it was a good movie, and at worst it was okay and a fun way to string together all the action scenes.
Plus Emilia Clarke is really hot