Reasons why it will be horrible:
1)The storyline is muddy, ridiculous, illogical, and confusing.
2)its doing the same thing that Salvation did: its ignoring all the fun and exciting ideas and themes that made the first 2 (and even the 3rd) terminator movies so popular
3)It will be PG-13. A movie about computers coming alive to wipe out humanity cannot be PG-13 unless the story was just so good to ignore the lack of blood and violence; see #1.
4)Did I mention nothing in this story makes any sense?
5)See Trailers #1 and #2
6)No James Cameron, No James Cameron, No James "the only man who can do this franchise properly" Cameron!!!