What are the criteria for bad answers?

Question

I came across a question that is regarding a concrete subject, requesting to know the duration of the deadline of a feature in a game.

The only answer was vague, inconclusive, and not actually true. I'll focus on them by bolding incorrect statements, and emphatise statements that while are true, they're not actually being helpful (they're essentially "yes, that happens, but you already knew that. I don't know when it happens either").

if the mission isn't a council mission or otherwise important for the story to continue, there is definitely a deadline. For instance, if you detect a UFO but don't have any suitable fighters to engage, after the day goes by the UFO escapes and might come back and shoot down a satellite.

Basically, you can't wait past midnight of the same day you get the mission or else it will disappear.

Gangplank and the other missions that expansion pack can be put off indefinitely and they will come back in about 2 weeks.

The answer has two downvotes, and is, at least in my opinion a bad answer as it's not only not really answering the question, but also flat out wrong in some aspects. However, despite being flagged by me, a moderator disagrees and declined my flag.

When/why should bad answers be voted, and what constitutes a bad answer?

Answer 1

I found the flag, and I was the moderator that declined it, so I will speak as to why.

It was flagged as very low quality - I declined it because it's not a low quality answer, it's just wrong. Think of low quality as more in regards to the actual format/structure of the answer - the more it looks like your cat walked across the keyboard, the more it is VLQ.

See this MSE post for more guidance. In general, flagging answers because they're wrong is not the way to go. That's where you should be using your downvote and commenting powers.