I found the tutorial dungeon cool but incredibly hard, the path finding of my second party member seemed to walk into fire on purpose! I had to unhook the two and move them one by one which shouldn't really be needed.
Yeah, I've been playing the alpha and now the beta versions for a couple months now, and this is still one of the most annoying issues for me. I know proper pathfinding can be very tough to implement, but I'm hoping the devs find a way to prevent party members from ever walking through damage environments (assuming the player isn't manually forcing the party to path through such an environment).