There are quite a few reading-order questions (I added the tag; it should perhaps include viewing-order in some way, but I couldn't think of a suitable word).
Personally, these questions seem ok: there are many series (e.g. OSC's Ender books) where the chronology of the books overlaps and/or differs considerably from the publication order, and it is confusing to know where the best place to start is. (Although my personal opinion is that publication order is always best).
However, they are clearly subjective. However, I feel that they meet all six of the guidelines for good subjective questions.
A question about the viewing order of the SW movies currently has 4 close votes. It seems like the biggest problem here is that the prequels are widely disliked, and so the answers tend towards "ignore the prequels", which doesn't answer the question well. However, I think Mike Scott's answer is very good: it usefully explains what a good order is.
Personally, I would vote down "the prequels suck" answers, and either vote down or not vote up the question (because it seems too subjective, although Mike's answer does counter that somewhat).
If the SW question is just a bad example of an acceptable type of question, should it be closed rather than down-voted or ignored? Does the community want to ban all questions of this type?