The fact that there is a master marksman is what broke your suspension of disbelief with The Avengers? It wasn't the guy who was in animated suspension for over a half-century, or the billionaire playboy in a suit of armor, or the being from another dimension who could summon lightning, or even the giant green monster that hit with the force of a freight train...
It was the bowman.
THAT was just too much to buy into.
