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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I think they did it because a majority of custom games that defaulted on infection could not be exported to h4 because of static character models and weapons that to my knowledge could not be altered in the game mode menu. This is just me speculating as this could be the same thing.