It was nice to see Krycek and Reyes again, but from the preposterousness of the story (which should have been titled "Scully and Mulder and Company Save the World") to the ridiculousness of the idea that they can make enough vaccine for 7 billion people who have only hours or days to live, to the frustratingly inconclusive ending (we don't know for a fact this show is gonna be back, do we?) it was pretty much of a disaster.
You know, if this show doesn't come back (which is entirely possible; look how long they took to get to the second movie or the current season), The X Files is going to go down in the annals of shows that ended horribly, joining Lost, How I Met Your Mother, and that bizarre season of Dallas where dead Bobby Ewing showed up in the shower.