pigsoup speaks for me. Some of the utter disrespect for players whom enjoy the competitive nature of 3v3 and 4v4's is mind blowing.
I'm not saying 3v3 can't be competitive. It can. Problem is in current state of the game it isn't and it will never be.
The first thing that needs to be done is to rework resources gain in large team games. We can start talking about 3v3 being balanced and competitive after that.
But don't trust my words. See it for yourself. Fire up some 1v1 or 2v2 games and see for yourself. Make sure to play few of them so your Elo will actually in a decent spot.
1v1 is the most demanding game mode because there is no team mate to back you up when you do mistake and your mistakes are punished much harder than in any other game mode for that exact reason. It's all about you. Your position is much more vulnerable as there are more ways to flank and you won't be able to secure all possible routes.