I think Alien 3 is a great film personally. Not a hair on Alien or Aliens but still a worthy addition to the franchise. The only thing that bothers me now is the outdated cgi but I've seen it that many times I know to expect it.
With Resurrection honestly I like it also , compared to the other three , it's terrible I suppose but the way they were going with the whole idea that movie could have turned out a lot worse.
I love how they all have different color tones , feels and atmospheres. 4 great directors each had a shot at this franchise all bringing there own feel. It's sort of a shame Ridley is coming back in that aspect. It sort of ruins that different director quadrilogy but it's worth it of course to finally get this prequel of sorts.