I hate to immediately critique 343 on Infection (one of the best game modes in Halo history) but why are they using ugly solid green player models over the actual Flood combat forms form Halo 4? Infection is way scarier when there is an actually Flood creature chasing you down.
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Because those models didn't allow you to customize anything about the zombies. You couldn't change their starting weapon and we're stuck with disgusting squelch and screams whenever playing as them, which was just annoying.