Look, i've been a critic of McCullum's attitude to batting in the past (more so in test cricket), but as an opening batsman in ODI's you have to accept that sometimes he will hole out looking a little silly early given that this is the role he has in the side. With a middle order of Williamson, Taylor and Elliott we have people who can stabilise an innings if an early wicket or two comes, but McCullum playing the way he does at the top can be a complete game changer. 45-60 runs from the first ten overs seems to be the norm against good attacks these days with the two new balls, and if McCullum has a flyer we can be well ahead of the game early. This is his role, and I don't really think you can knock him for it when it fails if you are going to celebrate it when it comes off and he plays the same way.
McCullum has had success of late particularly because he hasn't been a Spearman. He choses the ball to hit, has become a mite more selective and is much more successful.
I haven't heard anyone mouthing "that's just the way they play" ie defending hit out and get out, which they used to do a lot in a lame attempt to defend some of our players, because he hasn't been doing that. He's been consistently aggressive and devastating.
I'm not knocking his approach- I'm saying that he has done it spectacularly well up until the game that was an elimination one, and that goes for Kane too. Sure it will happen, it just really hasn't all tournament.