They weren't stopped by humans, they were stopped by Shepard. Saying that the humans stopped the Reapers is like saying humans stopped the Covenant or Flood
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Technically, the reapers were stopped by a giant multi-colored magic space dildo. [spoiler]That ending still ticks me off.[/spoiler]
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Being taken down by an individual isn't really helping their case. At all.
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Yeah, one individual who probably knew the most about the Reapers than any other human. If it wasn't for Shepard, honestly, humanity most-likely would've been railed. Along with the Turians, Quarians, Krogan's, etc.