I agree to some extent, but this one was clearly one of his better performances because it's not often that he puts 3 or 4 goals on a plate in one match. Regardless of what the rest of the team does, on an individual level this one was one of his better ones.
He's a moment's player. A guy with magical skill who will try outrageous passes, shots or surging runs, cause that's his style and he knows he can pull them off more than most. If it works he looks amazing and if not he'll look poor because the rest of his game (defensive work & awareness, ball rotation) isn't special if we're honest. Today, everything he touched turned to gold.
As a side note, some kudos to Ole for reinventing him as a wide playmaker. He's a risky player to play in the midfield two and Bruno is more of goal threat from the #10, so putting him wide with the freedom to roam and playmake was genius. Works well with Luke Shaw providing the width too.