Having high expectations can be a problem, in fact I think that is one of many reasons why Alien 3 failed, Cameron had raised the bar too high, It was unlikely that Alien 3 was going to surpass or match it.
That said, even going in with no expectations you can still be pretty disappointed. I became cynical with the franchise after Resurrection/AVP and I still get disappointed by Prometheus and Covenant, I guess when you got Scott as a director, you tend to expect more whether you aware of it or not, especially since he is the guy who directed the first film, which was a masterpiece. Granted he wasn't alone in making that film as good as it is.
As what I want for the future...I would like to see a reboot of the AVP side of things, perhaps kept in a seperate continuity with nothing to do the previous AVP films.
And maybe, just maybe a reboot on the origins of Alien where its not really revealed where they come from or if they are natural or unnatural, only that they were used as bio-weapons. The more I think about the prequels, the more I think they shouldn't be part of the main continuity. Have it as a spin off's or an alternate take instead. Like a "what if?" story.
There is many reasons why I have come to think this way recently, namely one of them is that like Resurrection, the tones of prequels don't really fit in my opinion and they largely ignore science and plausibilty. It probably doesn't bother many of you of course but I see the first film as fairly grounded in reality and I think such a gritty tone should have been kept in the series, instead they got more and more grandiose and loose with laws of reality.