Though the movie was engaging, it did not take advantage of the urgency created by Sarah Connors in the first two movies. I remember much more urgency in her prior to Judgement Day than I was in this entire post-Judgement Day movie.
The movie was a little meandering at times, but I think anyone who saw the first two (the third doesn't deserve much mention) would be compelled to see this one and will most likely be satisfied.