A:R still has some great moments, like the underwater sequence, when the Aliens escape, Elgyn's death, and when Ripley 8 discovers and destroys all of the clones. Sigourney did a fantastic job with that scene.
The story is not that great at all compared to the other films, but still makes for a good popcorn flick, and still a pretty good sci-fi film. In my opinion of course.