He hasn't been bad in the CL has he? All the doubt surrounding Higuain is about his choking in finals and not scoring when the going gets the tough. That's where it comes from.
I mean, for a striker as good as Higuain, it is amazing the sitters he misses. How many more goals could he have scored if that weren't the case? I can't remember Trezeguet or Inzaghi missing the kind of opportunities Higuain has.