After examining the rules, there are many flaws. https://www.wizards.com/dnd/files/excerpts/excerpt_dmg4.pdf

The maps don't use any of the optional starting rooms, for starters.

All 45 degree options are missing, as are odd shapes, stairs, pits, etc, resulting in ignoring or heavily modifying Tables II, III, III.B, V.A, V.E, VI, VII, and VIII,.

The rules also specify that the dungeon must start with a stairs entering a room, but it appears that this actually starts with a passage instead, which doesn't appear to require entering a room immediately.

Example: https://www.dungeonstome.com/dungeon/345345345.png The entrance enters the room using a secret door, however there shouldn't be a door between the entrance and the first room.