Should they be mandatory? In Halo in was common to see people work together, but in a good amount of other games its like 'screw my mic'. Destiny will be a full co-op game...so my question is should it be mandatory for us to have a mic to communicate with?
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There wouldn't be any reason to force communication. The best place to have forced communication in Halo Reach was playing Campaign Co-op or Firefight, but it was never necessary to succeed even in Invasion. I've played on a team of randoms against hyper-organized clans in Invasion and whooped 'em.