As this is the first iron banner you can't really take a result from it, as the reason why they're aren't that many drops is because it's the first event of 2.0. They stated that only weapons and armour that you can buy from the tower are the only ones that can drop, since it's the first one only the boots, sidearm and pulse rifle will drop; along with the class item. As the next iron banner event comes out the reward likelihood should double because you can get this iron banners loot as well as the current one that is undergoing. Please read before you make a huge complaint on the drop system when you don't know all the facts!