In the modern Royal Marines, as an officer you have to be able to do everything your troops can do, and more, and do it better.
Of course, you'll never be able to out-shoot the sniper, or come close to being able to command an armoured batallion anywhere as good as the guy who's spent his entire career driving his tank about.
As far as general duties go though, you have to be bloody special.
MC would never have been chosen as leader if he couldn't out-perform his peers in most situations, minus their specialities.
MCs speciality is his luck, or ability to see things that others can't, similar to Kurts sixth sense, albiet with a different purpose.
Not saying he's godlike or a billionty times better,just that he, like any SPARTAN is seriously good as what he does.
I fail to see how anyone can argue with this logic.