Aaah, I must disagree. Solaris and Zardoz are classic hardcore Sci-Fi. Albeit, Hollywood did some butchering on Solaris with Clooney to turn it into much more of a film noir than it was supposed to be. Go rent the old Russian version for the classic look. IMO, good Sci-Fi is far more about ideas and people at odds with themselves and existence, than it is about technobabble and gadgetry. If you take the latter view, I agree, Zardoz would look stupid, but that is not its point.
A1-4 are all very different movies albeit situated in the same universe. A1 is horror, A2 is action, A3 is a sermon. A4 tried to be an action sermon horror, and so mostly failed. All movies had a lot of potential but none reached it completely. Still, all of them were entertaining, in different ways, and much better that the usual Hollywood spam.
AVP probably accomplished only 30% of what it could be. A few very interesting ideas were wasted by some atrociously bad writing, a completely unremarkable cast of actors, and bad camerawork.
The AVP game for me was mostly the marine parts. Alien was annoying and Predator was too easy. To me, the best FPS is about a hero rising to fight incredible odds and triumphing by courage, skill, intelligence, and determination. If you are just a bug drone in a monster swarm, you are no individual hero. If the opposition are so hopelessly outclassed by your kit, where is the challenge?
In Sci-Fi, what I would like to see is a well-written, well-actored, lavishly made movie on the Warhammer 40K universe. I have some nifty ideas for a screenplay.