The advantage of a Megadungeon is pretty much that things kind of are ALWAYS available.  There's just potentially slightly less story.<br/><br/>I've been listening to a bunch of podcasts lately because... well, no screens or reading.  Apparently the precursor to D&D was this setting that there was a city above an enormous megadungeon and I was kind of just reading that and going, "Huh... It could be wall to wall adventure... Easy to jump out when they need a break... Can put definite plots into the dungeon...  Hmmm..."