I find that as an art-form, science-fiction has a lot to say intellectually. Maybe not all sci-fi can claim that it has expanded human knowledge, but some works have offered visions, commentary, and predictions which can be debated.
It still doesn't excuse being overly obsessed with it just because sci-fi is sci-fi and its being geeky. But it is I find a rewarding way to look at the world with new eyes and see perspectives that aren't found in the world today and history.
I wish it didn't have such a bad reputation as being immature, I suppose not all of it can be ground-breaking, there has to be room for shlock.