I re-watched every Alien movie. I've seen the first two Alien movies several times, they're two of my favorite movies. Alien3 and Resurrection I only saw once, and was anxious to revisit them.
I included the AVP series, as I remember seeing the original AVP when I was 14 and I enjoyed it then, but never saw the sequel. They aern't canon, they make no sense included in the Alien timeline, but why not include them.