"Reliability ratings", the inevitable suggestion for all online communities. It starts to point you in a direction of never questioning some people and always questioning others, basically officially sets a hierarchy of people in the community. Generally, I recommend staying away from it, since starting to grant merit to a documented hierarchy beyond what already exists is usually a bad thing. As an example and not campaigning against admin tags or AP tags, but all across online anyone with an "Admin" tag is automatically seen as more credible and more trustworthy than everyone else. Which generally can be true (especially here, Zach is never ever wrong), but it starts to get into the area of 90% of the time the general populous will side with the ones with the tags in a disagreement. This usually isn't a problem with admin tags, I think the benefits of admin tags outweigh the negatives, but that scale starts to tip the other way when you start to granularly weigh the individual people against each other.
TL;DR I get the value of the idea, but it is a slippery slope of basically ranking members, since personal opinion will almost always gets conflated.
This is oddly something I am kinda passionate about, as I have seen communities go to shit going down this path. A good alternative is attributing accuracy to the information and not the person, a tag for a post that has been verified and confirmed, like a "Gold Star". But not then counting people's Gold Stars against each other.