They were great movies that captured people's imagination that you could be more in a hard world/universe, a coming of age that was it's message. It always was aimed at kids, even the kid at heart in most adults.
There is no way of telling what is or isnt scientifically correct. Most of our knowledge about space/time is all theory, not 100% accurate, until we actually set foot on another planet, or develop true space exploration, or actually time travel it's just entertainment. Sci fi is so important to our evolution that people dont really understand it's impact. Every gadget we have today was inspired by some kid who saw it in a movie and made it a reality later in life.
We know there isnt really any sound in space due to a vacuum. ME, I want sound in my movies during a fight scene. Imagine how lame the fights would be just seeing lasers and people screaming, wait no sound just mouths agape. I'm sure the mime community would love the opprotunity for work. I liked the fact that shields took a beating, Destroyers couldnt steer fast, military tactics, just to name a few. It was space samuri's against gun toting technology! The old ways were better, rather than progress being superior.
What I do hate in sci fi movies is messing up time paradoxs like Paycheck. I hate a whole movie about the fagility of messing with time only to have the "hero" at the end cheat to advance their desires without any consequences for some odd reason. The character caused the downfall of man through his invention, had to sacrifice his fortune to get the things he needed to right the wrongs, get the girl, cheat death, and oh yeah got his fortune back by buying a lottery ticket that equaled the fortune he should of gotten for his invention, yeah that blew dog. There are other movies without a doubt that infringe on this travesty, but you get my gist.
I go to a movie to be entertained, not learn life's lessons, that's my job or my parents, an $8.50 movie ticket just isnt going to make it happen. I try to suspend disbelief and look at a picture overall, I'm not looking for absolute true life, just imagining a different reality that could be reality if I lived in that environment. I admit I pick apart a movie afterwards on the "holes" witnessed, but only bag on it if the ending blew. A movie could be mediocre through most of it, but if it nails the ending, then its a keeper. Some have the idea so perfect, but horrible "hollywood" ending that they made from their focus groups. This is what kills movies, they need to stick with the ending that was written originally. The problem is that it is big business, not art, and the more happy people the more successful it will be. I want movie magic, that's what I'm paying for, I want the hero to win, but there always should be a price to be paid (a death/loss of money), and unfortunately todays movies are missing that vital componant