Whole game written
What is so bad about that? That the DM has planned the story is awesome! Part of being a DM is adjusting on the fly. My impression is Tylermalan is very capable of doing that. Some times you just have to be fair to the game to be a good DM. When they jumped down the whole without the entire party, then two PC's went back alone at different times? I might have given more "your about to die hints", but that is just DM style. EveryDM's style is different.
It is totally on the players if they do not have the essential elements of as adventuring group! Our group generally decides to fill out the 4 corners of a group-Main Combatant, Arcane Spell Caster, Divine Spell caster, & Expert. Then the other 2 players "get funky" (since there are 6 Players and a DM).
This party seemd to have it covered, until they split up. The more I think about it, the more I think tylermalan was fair. As a DM, I think you should avoid TPK's, but these guys seemed to aks for it, Ian.