Have you ever noticed that when people are in on something from the start, they become extremely resistant to change, and typically view newer material as inferior? I see this all the time with entertainment - music, video games, movies, etc.
The old Star Wars movies are shit. I love them to death. I was raised on them. But they are shit. The dialogue is terrible, the acting is terrible, the script is basically swiss cheese. When I was a kid, I didn't notice that stuff, of course, but that is because I was so engrossed in the world.
I would bet what you are really longing for is the sense of fascination and wonder you got with the old films - and when that is your perspective, you are doomed to disappointment. If you approach it as you would any other movie, without that hype and without that expectation, you are far more likely to say "Yeah, that was decent. Not great, but decent."