It's also back to basics, with a person running, a person chasing, and a person trying and failing to get in the way. And I like that.
Two things clunk in the movie. One is the "jokes" - from the Terminator being clunkingly obsolete, to the knowing asides to the other movies, to the Terminator getting his leathers from a gay stripper. The T-800 isn't a threat, he's a bit sad. The world seems to be ganging up on him to mock him.
The second is that Arnie has just lost it. He used to be able to do Impassive Killing Machine, and now he just can't. Something happened, he got old, and he's just not scary anymore.
Having said that, I really dug the plot in a chin-stroking kind of way, even though this is a Terminator film which is at it's worst when there's Terminators on screen. So I'm giving it 7/10.