Yeah, maybe so. But he just entered the match and Ramsay will bow out soon after.
People who label the Stark kids incompetent forget that they were the Stark kids. After season one, they are split up and alone. They've gone through the growing phase and their competency level is going to take off. Two of the three most important are now together and the third just declared her independence and most likely intent to return. Their effect on the game board is going to skyrocket.
I give them some slack. Jon has been fine. Robb was cocky.
Sansa was a silly, stupid, pretty girl raised as a princess, who wanted to be a princess. She didn't wake up to the harsh reality of the world until Ramsay forced her to. A bit late considering Joffrey was a monster. Then, once she's a little more experienced, she still botched the situation with Littlefinger, who she could have wrapped around her little finger and who's army she needed.
Arya is playing a dangerous game, but playing it well. She has a single mindedness of purpose, and is willing to risk all to achieve it. She may well do it. If I'm in Westeros, I don't want to be on her list.
Bran? He's along for the ride, none of this is really within his control.