Destiny is a GREAT game but to have it be this true social gaming world, it needs to have bigger fire-teams. Let's show Bungie that we want to be able to play with more then 3 of our friends at a time.
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3 is fine, more would be too much for story missions. Maybe for strikes, raids, and exploring but other than that no. They'd have to nerf supers or orb of light generation. With 3 people its easy to keep using supers