I know that fans are sharply divided on this as they either regard Alien 3 (or Alien Cubed) as a flawed masterpiece or a piece of trash, same with Resurrection. It would have been awesome to have Ridley Scott do 3 and James Cameron cap it off with 4. But what's unique about all four movies is that all of them had newish directors at the helm. So you get to see a unique visual style across the board. Personally, I liked 3, and it was brave to kill Ripley at the end. People clamor for Newt and Hicks to have been included. but I'm not sure how that would have worked. Carrie Hen was a teenager by then, so it would have been impossible to continue directly after without recasting a new child actress. The Assembly Cut I think is as close to what David Fincher intended as we are going to get. Resurrection I thought had some neat ideas with Ripley being a "mother" to the Alien and it wrapped up her story nicely. Through all 4 movie, she's trying to get back to Earth, and she finally does it here.