Dude, have you ever even watched the show? I admit it isn't for everyone, and it suffers from more than its fair share of pointless filler type episodes, but when it hits the mark, it really hits it hard. Episodes like The Constant are some of the best sci-fi I have seen in years. Sci-fi is something that, IMHO has been pretty much dead for the last decade or so. It is really rare to find anything in that genre worth watching, so to me, Lost is quite a treat. I still say it is the best sci-fi show since X-Files' early seasons (not to say there wasn't some great stuff between the lifespans of those two shows, such as Life on Mars (the real one, not the worthless US remake) and Firefly).
That said, this season will make or break it as a whole. If this season fails to satisfy, then the entire series won't be worth a whole lot. If this season can pull it off, then it will be a series worth recommending to future generations. If not, then it will, unfortunately, end up being just another TV show better off forgotten.
With our current TV market saturated with the most worthless sitcoms (serious, name ONE genuinely good and funny one), reality TV shows, and about a zillion crime dramas all featuring increasingly longer acronyms for names (all of which rehash the same tired formula night after night), and it is always the sci-fi shows that people are the quickest to piss on. Ironically, it is usually sci-fi fans who are so quick to piss on them, while they are more than happy to give NCISJAGNYPD and all the other nonesense on there a pass.
Sci-fi has a long history of not being taken seriously by the general population. While, often times, sci-fi is a great vehicle for touching on some very deep topics in ways a realistic story would have a very hard time doing. Finally we have reached a point where the value is being seen in sci-fi. When Lost took its swift turn toward straight sci-fi in season two, it lost a lot of viewers. But it is still pretty cool that a sci-fi series can be given as much credit and attention as Lost has gotten over the years.
I don't think the comparison to Indiana Jones and the Aliens is very fair. Sure, Indiana Jones always had sci-fi elements to it, but it was its own brand of sci-fi, voodoo curses and mystic artifacts. Introducing aliens too it felt really out of place. And honestly, the aliens would have been just fine, if the rest of the movie would have been worth watching. But as it is, IJATKOTCS sucked through and through.