three is good four is better for concept reasons. You can split up with out having anyone alone more combat opportunities and epicer battles but bungie can only do what it can
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I like three though, its not following the rest of the crowd. Also it opens up for more intense closer teamwork and way more nerve-wracking sits when you do have to split up( i like when games make me panic and have to make on the fly descisions). But yeah I totally see the benefit of four.