You know me too well, the 2nd was a Voltron/GoLion quest... both were in response to the new series in the case of Voltron and new movie in the case of Transformers (god I did an insane amount of work on that franchise.... even just adding characters started feeling like a chore)
@EganTheVile1: Let me guess Transformers quest:P
I think another problem is the obscurity factor, CV and GB really stick to quests that seem a bit braindead easy at times regarding the larger publishers/companies characters, Screened usually sticks to blockbuster movies, while we have some very obscure references in our quests, one of the quest answers has yet to even be associated to an anime or manga (he is an answer in the look who's talking quest)
I would tend to think, IF we do another quest it should center around a well known franchise and see if the completion rate is still so low, I think the only reason completion of the Polemon quest is so low is that one of the answer pages was deleted, so there is now a page no one knows to click as a replacement answer.
If we did a Transformers, Naruto, Bleach, Death Note, Voltron or other big name franchise quest I bet the completion rate would be higher.