Yeah I don't think Arya even said a word but that was definitely Arya looking annoyingly at Sansa. That was her gloating at the bull's eye. I thought the kid who plays Bran did really well too. They nailed it casting these two crucial child roles. That was my main worry I think. Arya and Bran have to work, and it looks like they will.
Yeah. Arya and Bran need to work for the show to be good, since they have a lot of chapters on their own. Sansa is another character who needs to work, i really haven't seen any scenes of her except for one which i really don't want to spoil.