This movie was OK, but not great. In most movies, there's a certain amount of "suspension of disbelief" that the viewer doesn't mind. In this movie, it is hard to ignore.
For example, it takes place after the first three, but relatively speaking, it's a piece of cake to kill the terminators. You just drop a hunk of metal on them, and they die? come on.
However, there's a lot of great action, the special effects are good and the acting's not bad.
We're not sorry we saw it, but liked the first three movies much better.