My first post on this site! I'm currently level 26, with my mains being either Lifeline or Caustic. I'm not that good at it, but I do have around 12-13 top 3 finishes with maybe 5(?) wins. I've been playing with randoms since the game released, for the most part I haven't ran into too much trouble. People are generally good at communicating (at least on Xbox), even without a mic. There has been several times where people will drop out of the lobby mid-startup, and that really screws up the game unfortunately since it's so team focused.
So far I'd say my favorite weapons are the wingman, R301, and the EVA 8 (I'd take the Peacekeeper over it, but can never seem to find one for some reason).