I honestly think no matter how 343 made the game.
They could have made Halo 4 like Halo 3 and people would have complained that they did nothing new and not buy it.
And people now view Infinity Slayer as Call of Halo.
just my thoughts.
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I still don't like it because of the lack of 4v4 maps, a skill-based ranking system, join in progress... I could go on, but you get my point.