As fans of SF we often forget the past in the rush to seek out the newest thing available. I'm guilty of that as well. I love it when a new SF film, TV series, or book comes along that even the critics have a hard time dismissing. Just thinking over the past few years offerings there has been a new Jurassic Park sequel, the John Carter of Mars movie (although not exactly praised by the critics, but worth noting), there is a new live action Tarzan film on the horizon, slated for next month I believe or shortly thereafter, a Max Max movie that even was nominated for some Academy Awards, and so on.
I think we all tend to glom to our favorite movies, and generally those tend to be the formative years when we first became aware of the genre, whether it be our teens or sometime around that time frame. For me it was around that time that I discovered Ray Harryhausen, the Johnny Weissmuller Tarzan movies, those older SF movies, the Disney adaptations of Jules Verne's 20,000 Leagues Under the Sea, The Castaways, H. G. Wells, The War of the Worlds and so on. I loved that stuff then and still do.
For those born later, it might be Avatar, the newer Planet of the Apes reboots, District 9, or something else. We all have our own favorites. Just today I was switching channels on the TV and ran across a movie I get drawn into from time to time, and even have a copy of on DVD called Enemy Mine. It has great old school practical effects.
Be that as it may, I ran across this article today concerning what was the best year for science fiction ever. For the writer of the article he says, 1912. Although the article may have some truth in it, it seems a bit more slanted towards literature rather than movies or other areas of SF fandom, I think I'll let you read it and decide for yourself. Adding that it is as arguable as anything else when concerning fandom. We all have our favorite years as gateway to the medium as state above. So rather than arguing the point, I think I'll let you read it.