Big difference between expecting a shut out and expecting to not give up incredibly soft/stupid goals and subsequently leads early on in two playoff games in a row. Huge, huge, huge difference in fact. Those kind of goals set the tone and both days, Boston comes back and scores another within just a few minutes. Again, he's hardly the only problem, but when your goalie is giving up leads to a team like Boston early two games in a row in the playoffs, it's a very serious problem whether he plays better the rest of the game or not. He obviously wasn't exactly lights out the rest of game two either.
Jimmy Howard did not give the Red Wings a chance to get things started against Boston, but he absolutely straight-up handed Boston that chance, two playoff games in a row. That's the bottom line and that's why it's a serious problem no matter his play the remainder of the game.