Hey, if you were actually prepared, you wouldn't be having tiny mistakes.
Honestly, you people are just whining because it's not really that bad, not even compared to other RPGs of the time. I'll take the Crystal Tower/World of Darkness shenanigans over the Road to Rhone and Hargon Castle bulltrout in DQII or the Neutral path final dungeon in Shin Megami Tensei 1. At leas the dungeon isn't throwing enemies at you that can easily wipe out the whole party before you get a first turn or is some multi-level maze that involves you having to travel the dungeon almost twice to clear the game.