If that's what you want to know look at the karma votes of the corresponding posts. People vote down posts they don't consider acceptable.

The problem with this is that deep in some long convoluted thread that only a few people are following and even fewer are voting on based on careful consideration of the merits, the karma points could be far from reflecting what the overall community consensus would be, were it fully informed. And sometimes the votes do reflect the community consensus, but this uncertainty gives people an opening to think they are being treated unfairly, and that they could get justice if only they could bring the incident to the whole community's attention.

I'm not sure how big of a problem this is, but it may be worthwhile to try some relatively low cost solutions. For example, have a special post where people can post comments requesting reviews or explanations of karma points on some comment or whole thread, without having to make a big deal about it. (And link to the post from the site's introduction or FAQs so people can find out about it.)