By 'low quality' answers, what are you referring to exactly? There's a bunch of old content from 2010 and 2011 that lacks a lot of detail, but from that point onward, we've disallowed anything that doesn't include EVs and the like. Those threads are old enough that they've accumulated new answers under our heightened moderation approach, so there should be no shortage of passable content on moveset threads. I don't see the flaw in removing new threads, and I think allowing new ones is a bad idea anyway, as explained here.
Is the issue to do with the format? I don't think excluding that is making the content low-quality, but I can understand the frustration at being unable to tell what tier or ruleset the post is following. You can tell at least some of that with context though. For example, the majority of stuff posted in 2013 to 2016 is going to be Gen 6 content. And you can tell if people use the Showdown import format for their set, that they're probably following a Smogon format of some description.
Should we actually require that people specify format? I can guarantee you we'd lose a ton of decent content doing that -- very few new users actually follow the moveset rules, and I can tell this based on the amount of stuff I'm taking down already. A lot of the time, a set that's good in one format would be good in another format anyway. I'm not convinced there's an issue with our current ruleset.
Tl;DR if you're not finding passable content on the moveset threads, you're probably not looking hard enough.