We have downvotes for that (and in some cases "Very Low Quality"). It seems that basically every time I see a flag in the queue, it has at least one "Not an Answer" flag stuck to it, no matter what's wrong with it. The flag queue right now has six answers in it flagged as NAA, when all six are answers.
For reference, I'm talking about these kinds of answers. It was flagged as NAA, even though it's clearly an attempt to answer. Whether it follows the spec or not shouldn't matter, the same as on any other SE site.
I've been marking these flags as invalid, and will continue to do so. I encourage others to do the same.
Is there any dissenting opinion around here that I don't know of?