It really amazes me how some people manage to get even as high as rank 100 in 3 vs 3 RT. You guys should really consider playing the lottery. No, seriously: By the end of last week I was about rank 800 with soviets in 3 vs 3 AT, then suddenly I get an inactive teammate. No big deal I think to myself, quit after 5 minutes and restart the search. Next match I have a similar problem. The first words of my teammate were " STFU. I haven't played in 5 years" followed by him ragequitting, after I pinged his riflesquad 2 times because it got nailed by a MG 42 and was under fire from OST pioneers. Unfortunately I got teamed with this guy in my next match again, so again a defeat.
By this time I already had dropped about 250-300 ranks and things weren't looking brighter the next 2 matches. Now I am at about rank 1700. So how do you guys do it? How do you get so high in RT matches?
Edit: Said AT but meant Random Team
Right now, I think it's really hard to move up in rank if you're stuck in purgatory (300+). One of the problems is that new teams have no ranking, so you can end up playing a group of people that are normally top 100, or even top 30, with a group of randoms that are top 6k on a good day. The worst thing about that is that it will count as a loss against an unranked opponent so you will lose about 100 levels.
I don't think there is a way around this unless Relic changes how they do rankings for arranged teams. If it was possible for the matchmaker to use the individual players's best or average ranking to come up with a composite then it would result in better matches. When I'm playing with a new team, the games aren't usually very fun anyway because playing a 6000 rank player seems like a waste of time.
Pinging is toxic behavior more often than not. Never ping more than once. When you are going to ping, just use it for when you're sure someone isn't paying attention to a unit and it is going to be wiped. Even then, you shouldn't ping if they've got multiple units fighting, as you're creating another distraction while they may be at the limit of their micro. In short, you created two of those losses by pinging and didn't accomplish anything.
Other than that, both Elchino7 and Aegion gave good advice. The only thing that I'd add is that you should always try to contest all of the map. I often see people give up a section, but all that does is enable a player on the other team to get a larger portion of the map and then crash down on the next player.