Maybe it's just because I always turn off voice chat in Call of Duty games, but I didn't feel like this game suffered without it. The different weapons seem to have their roles to fill, so as long as people figure that out and can handle playing that style, it should be fine.
That said, I noticed that the D-pad had two shoutouts on it, "C'mon" and "Booyah!" If they made it so you could set up four custom shouts on the D-pad, just having things like "Over here!" and "Split up!" seems like it'd cover most sort of team strategy for the game.