My wife and I were playing The Dead Marshes and we ran into something that seems to make the scenario a bit too easy to win.
We were on stage 2b, but not yet on the final Escape test, when Gollum got his eighth resource token and was shuffled into the encounter deck. Quest stage 2b states that the Quest deck gets re-set to 1b if the final Escape test is failed, but we didn't see it indicated anywhere that the Quest gets re-set if Gollum gets shuffled into the Encounter deck.
So we get the three progress tokens on 2b and then dither about exploring locations and killing monsters, waiting for Gollum to come back during a quest phase. He eventually does, and since we've got the progress tokens needed to defeat stage 2b, we do the final Escape test, but Gollum has no resource tokens on him so the final Escape test is an instant win.
I'm sure we're missing something, but it seems like you want Gollum to escape early on so he'll come back with no resource tokens on him, although I do realize you run the risk of him getting drawn as a Shadow card, ending up in the discard pile, and having to wait for the Encounter deck to be reshuffled.
Any thoughts?