Well, it's been talked to death how 'Alien Resurrection' painted the series into a corner a little too unnecessarily. It essentially got rid of both the Colonial Marines and Weyland-Yutani, only to replace them both with the far more inept United Systems Military. It also essentially destroyed any possibility that the derelict might have survived the explosion of Hadley's hope.
Now, there are ways around those factors, but the actual film limited certain iconic possibilities rather than expanded upon them.
Still, I'm one of those who liked Ripley 8. It's just a shame that the only continuation of her we got was in the awful 'Aliens Versus Predator Versus Terminator' comic, which did the character no real justice, at all (or even the concept it relied upon, come to that).