You know, I like Terminator Salvation, and wished they had continued that series. I didn't mind moving the series to PG-13, as to me blood is not necessary for this story to be scary or ruthless.
I also like the idea of them playing the time travel rules and asking why didn't the Robots just send more and more robots earlier and earlier in the past. I mean if you think about it....just send one robot into the past far enough to kill the ancestors of Sarah Conner. Simple.
The movie I didn't like was Terminator 3. I thought it was shallow, and I didn't care to see Judgement Day, because what that turned out to be was pretty uneventful.