**My view.** My suggested criteria for migration is that the question is on-topic here, and will get better responses here, and has not already received a non-negligible number of answers or votes.

I'd urge moderators to avoid migrating questions after they've already started to receive a non-trivial number of answers, comments, and votes, as that leads to a situation where pre-migration votes from the original site overwhelm the number of votes that are likely to be cast by our community.  If it is going to be listed on our site, I think we need to have ownership and control over the answers.  Migrating a question after it has already received more than a few votes from the original site prevents us from taking on that kind of control and ownership.  See, e.g., [a list of bad migrations I compiled earlier](https://security.meta.stackexchange.com/q/494/971).

If a question already has multiple answers, or has answers with more than a handful of votes, then I would suggest that it not be migrated.  It should either be left on the original site, or the original question should be closed and a new question should be created on our site.

That's the position I'd advocate for.  But I'd like to hear the view of the rest of the community, and of the moderators, too.

**The reason I'm bringing this up.**  We had [another dubious migration today](http://security.stackexchange.com/q/9286/971).  The migrated question comes here with two answers that already have 26 and 12 votes.  We don't have enough voting members on this site to come anywhere near that; very few questions on this site get anywhere near that many votes from members of our own community.  Thus, at this point, it is a given that votes from the original site are going to overwhelm votes from the IT Security community, for that question.  I don't like having a question and answers listed on the IT Security site, when the votes are overwhelmingly from some other site and when the IT Security community effectively does not have ability to perform quality control of the answers.