Is Wikipedia unreliable?

I go there a lot to learn about random stuff, but when I use it in school for a report my teachers tell me to find another site because its unreliable. Also a lot of my friends dont trust it, but others say its reliable because they have tons of moderates that check everything before its changed. So does anyone... show more I go there a lot to learn about random stuff, but when I use it in school for a report my teachers tell me to find another site because its unreliable. Also a lot of my friends dont trust it, but others say its reliable because they have tons of moderates that check everything before its changed. So does anyone have an opinion or definitive answer?
Update: So it's the people like Joe and his friends that ruin it for everyone else.... :(
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