I mean, honestly. Halo 2 came out, a bunch of people started hating it. Halo 3 came out, everyone suddenly "put aside their differences" and started hating that instead. Halo: Reach? One of the biggest hate problems so far. Halo 4 is no different. I seem to see a pattern here.
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^I'm sure Reach is so praised now since Halo 4 is out.... Every game has hate though. No doubt about that. It's just to what extent.