It's not as good as Terminator or T2, but significantly fresher than T3. There is enough action to make it a great popcorn movie and the main supporting male shows up Christian Bale. People who like the Terminator series should find it a very satisfying segway into the future.
The only knocks I have on the movie, ableit small ones are that there are too many Good Looking people in post-apocolyptic California and the special effects occasionally are clearly CGI. But don't worry about the effects as they are easily a 4 out of 5.
Since my wife liked it, it is at the minimum an enjoyable movie. If you are a fan of the Terminator series or enjoy summer popcorn movies see this on the big screen.