Well, you are either new to voting, or generally vote in a way you'd like to improve on.
Here are conditions for what number you should vote:

5: You were entertained through the whole thing, it was immersive and you really looked foward to continuing to watch/play it.

4: It was pretty good but you've seen better.

3: Good effort, probably worked somewhat hard on it, but it isn't something you like too much

2: Doesn't look like it was worked TOO hard on, but it isn't as bad as spam

1: It wasn't interesting, you may have found yourself doing other things in other tabs while listening to it if it was a movie, or you quit early on if it was a game due to unplayability

0: It was spammy, only a few seconds long, and just all around.. terrible.
Or there was nothing. So in short, 0 = nothing or at least the equivalent of nothing.

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Note: Vote on the quality of the work itself, not your opinion on it's concept.
For example, if you find a movie about vampires, don't vote it poorly because you hate vampires, vote it poorly if it's quality is actually low.
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How should I vote on under judgement submissions?

Vote on them like you would anything else, however if you notice you've seen the exact same thing elsewhere on this website, chances are it's stolen, and you should blow your whistle on it.
Don't leave a review about it being stolen, because if you've made a mistake it could make a legit submission get an unfair low score.
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How long should it take me to make a decision in voting?
Keep in mind that if it is a movie, watch it COMPLETELY before you vote, and if it's a game play it as much as you need to to make a decision, aslong as you play it for atleast 5 minutes. No, not the five seconds you call five minutes, I mean the ACTUAL time five minutes, or more, preferably more.

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And in spirit of the Holiday:

Holiday Quote:

"Fruit cake is like sperm, there's an awful lot of it around but no one wants to swallow it".