(Very low quality)
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There is a big miss understanding about this flag and about down voting here.
The "low quality flag" is useful and should not be removed from the options available. What users do not understand is where to apply it most of the times.
The low quality flag should be applied when ever a post has reasonable amounts of confusion, spelling and grammar or simply the simple contents of it cannot be rescued without having to spend huge amounts of time investigating any information is supplies, (ie for the last case: url answers and one line solutions that don't really explain how would that be a solution).
Normally what we see in the queue are answers flagged as low quality that are not the solution for the issue and people that do not agree with what is being said. But the post is an answer, it has information up to a certain point.
Those most of the times are not bad quality answers and the only reason they where flagged in the first place is that someone doesn't agree with them. That is not what flag is for, that is what down votes are for.
If an answer is a comment, a request for further help, added information that should be somewhere else or just something that cannot answer the question flag it as not an answer.
If you disagree with an answer, think it is not the correct one, would rather not see it there because of the path taken to help the user (dangerous instructions, etc) down vote it! Do not mark it as low quality!
If an answer is confusing, has severe formatting issues, you think no one would figure out what was being said there or its just an URL that does not specify the information linked you can flag the post as low quality and down vote it if you wish.
Down voting should always come first before a low quality flag, posts that are down voted enough will eventually be deleted and unless they cannot be rescued of fit the reasons above the flags do not need to be approved / declined.