I see what you're getting at, but McLane et al are all 'super human', reliant on uncanny sixth senses and hunches, (not to mention violence/ threats of violence). They get smashed and bloodied but get up to carry on.
Superficially McNulty shares a similar shitty attitude to authority but its born out of a different place. He has a fundamental contempt for the system within which he works. He is shambling and self destructive, stumbling through life leaving chaos and disorder in his wake which people behind him have to clear up, both at home and at work. He has to face the consequences too.
Occasionally he shows flair, but you wouldn't argue that he was a better cop than Greggs, Bunk or Freamon.