Basically, like MGO, you press SELECT and you can either text to everyone or just your team in the lobby and in the game. You can use the directional pads or a keyboard. This would be great in very intense matches and tournament matches. Of course, in no respawn matches, when you die, you can't use that feature to cheat. Should this be implemented?
I love in game chat. The way it's implimented would have to depend ont he gamemode though. For instance if a gamemode is team based then you of course you'd want a team locked chat. Or even better yet the chat is "local" so only players within say 30m could see your text, you'd want to make sure not to discuss strategies within enemy ears.