Giroud may not have the best shots per goal ratio but the reason he gets the chances is because he finds the space and he out-muscles the defenders around him which allow him to score 20+ goals a season which is really what you want from a striker. Doesn't matter how they do it as long as they get the 20+ goals. He can have 1000 shots missed for all I care as long as he gets enough of them in. Strikers are and will always be judged on their goal return, not how many they score per chance created and Giroud scores enough to qualify him for a team like Arsenal.