Somehow, I figure Gunny has no clue on how to properly operate a bow. He doesn't strike me as the type to hold his breath, calculate his arrow's trajectory and aim accordingly. Bullet Drop and Arrow Drop aren't quite the same things to keep in mind.
That goes without mentioning how Bullet Drop is practically nonexistent in Gunny's Halo-esque universe, if the same basic shooter rules were followed. Halo's idea of bullets dropping is that your hitscan weapon has a specific range, and anything beyond that range - even by half an inch - goes Scot-free.
Considering - yeah. I figure he'd play Skyrim the way I first played a distance-based character in Oblivion, back in the day. I lined up my reticle at whatever it was I had to shoot and clicked away madly. Needless to say, I needed a few attempts and a few YouTube videos to get out of the tutorial dungeon.