I've never read the Avatar series: so keep that in mind... they sound like they could be worse than the "Marco Volo Trilogy".
One of My votes for the worst is the Marco Volo trilogy. They were actually pretty well written, somewhat humorous, just terrible to play. This was a series where the party basically followed around the NPC Marco Volo, who got to do all of the interesting stuff. Marco Volo was written as totally annoying, yet with lots of good dialog as well, so the party was not only useless, but also completely outshined, and burdened with a completely annoying NPC. Simply unplayable.
My other vote for the worst is B9 Castle Caldwell. The crappiness was alleviated only by its brevity.
The first "adventure" is when the party is asked by a guy to clear out a keep that the guy inherited. The keep is basically a donut shape, surrounded by rooms filled with completely arbitrary monsters. The party has to circumnavigate the keep, going room to room, killing the monsters. one room has bandits. The next room has kobolds, the next room has slime, the next room has stirges, the next room has orcs, next room has a mummy, etcetera. In the middle of the keep is a door that cannot be opened until the party has cleared everything on the top level. Then the guy who inherits the keep gives the party a key to the locked door. The party is asked to clear the basement of monsters. This is roughly a repeat of the first level, the party goes from room to room getting rid of the completely random monsters.... except at one point there is a "trick" There is a secret exit that can only be opened if the party recites the lines "Owah tagoo Siam" 3 times (oh, what a goose I am).
This is the only adventure that I ever threw away. I sort of regret throwing it away, because I'd like to go back to it and make a "worst module ever" thread similar to the treatment received by the Forest Oracle. I do believe that Castle Caldwell is as bad or worse than the Forest Oracle.
One of My votes for the worst is the Marco Volo trilogy. They were actually pretty well written, somewhat humorous, just terrible to play. This was a series where the party basically followed around the NPC Marco Volo, who got to do all of the interesting stuff. Marco Volo was written as totally annoying, yet with lots of good dialog as well, so the party was not only useless, but also completely outshined, and burdened with a completely annoying NPC. Simply unplayable.
My other vote for the worst is B9 Castle Caldwell. The crappiness was alleviated only by its brevity.
The first "adventure" is when the party is asked by a guy to clear out a keep that the guy inherited. The keep is basically a donut shape, surrounded by rooms filled with completely arbitrary monsters. The party has to circumnavigate the keep, going room to room, killing the monsters. one room has bandits. The next room has kobolds, the next room has slime, the next room has stirges, the next room has orcs, next room has a mummy, etcetera. In the middle of the keep is a door that cannot be opened until the party has cleared everything on the top level. Then the guy who inherits the keep gives the party a key to the locked door. The party is asked to clear the basement of monsters. This is roughly a repeat of the first level, the party goes from room to room getting rid of the completely random monsters.... except at one point there is a "trick" There is a secret exit that can only be opened if the party recites the lines "Owah tagoo Siam" 3 times (oh, what a goose I am).
This is the only adventure that I ever threw away. I sort of regret throwing it away, because I'd like to go back to it and make a "worst module ever" thread similar to the treatment received by the Forest Oracle. I do believe that Castle Caldwell is as bad or worse than the Forest Oracle.