Wooooooah dude that's a big statement X Files is 6-7 series of awesome + a bit of Robert Patrick + the smoking man ..... that's a bit hard to beat.

Ahhh shame. Though honestly spoilers don't matter TOO much with lost. (Although if you haven't had the series 5 finale spoiled you will think it is AMAZING). Since character development is its backbone, you still get that when you watch, even if you know some of the story. Plus, noone knows anything about the last series so alot of the mythology is still guesswork.