I would rate it a 0, but since you said 1 to 10, I have to say 1. It's not quite so bad for entertainment, but for anything serious, you're better off not reading it at all, because it could contaminate your mind with misinformation.
It's admirable that you edit articles in an effort to add facts. But if someone else comes along and reverts you just because, then your effort is wasted. Or worse, they take what you wrote, misunderstand it, then rephrase it according to their misunderstanding. If you try fighting it out, it doesn't matter if you're knowledgeable on the topic: the Wikipedia admin will win the argument even if they're complete ignorant idiots.
If you absolutely can't find any information on a given topic, here's what you do: you follow the link from the search results then you scroll all the way to the bottom. If you see any external links, click on them. If you see books listed, look them up in your library's website.
Yes, I know a lot of Wikipedia articles are "sourced." That doesn't necessarily mean they're sourced correctly. If you don't bother to check that page 417 of the Romanian Neurological Journal really says restless leg syndrome is caused by undermedication, or that such a journal even exists, then the source is worthless.