Proximity Chat ASAP Please
For me personally, the game could use more HUD options, an offical Hardcore mode, and more gaget availablility across classes.
But most importantly the game needs a way to promote and facilitate cooperation. This could largely be fixed with same team proximity chat. Large scale battles where you can only really communicate with 3 other people who want to play completely different objectives often becomes an unfun lone-wolf enviroment; players quietly fume or rage in the chat at the forced disorganization.
Right now, the game is needlessly frustrating, there's a constant sense of resentment on every team because entire engaments are lost over the inability to contextually warn others, plan, or ask for help. A core appeal to the game is it's cooperative element, and currently that element feels fleeting, and rare.