I've actually played the whole way through, and I can tell you that there is some organization to the dungeons. A lot of them involve backtracking, which you can probably notice more easily in the first dungeon, since it's a bit less complicated than the others. If you aren't terribly good at keeping certain things in mind (room layouts, floor numbers, items needed to bypass certain traps, etc) it can be a very tough game.
It's not broken. Just hard. If it were broken, Euclid could have just made a bunch of dungeons that trap you in there or make lots of instances where enemies are unkillable. It's just a hack that makes you think and try harder than most every other official Zelda game. Don't mistake difficulty for the game being totally unplayable, because you're missing out on a worthwhile challenge that way.
