I haven't been playing for 2 years straight with the same people. I will probably never do 4v4 ranked, because every game my team will probably get slaughtered. Guess ill only do solo ranked.
Like everything, it takes practice. I imagine a lot of new teams will be entering the ranked 4v4 scene to get those rewards, so you might as well start now trying to find a core group of people. Don't get discouraged, even the best lose, learn from your mistakes.