If you knew what you needed to know then you wouldn't be complaining about the story or lack of missions. Take this into account. The damage you do in normal crucible is the base damage of level one weapons. Meaning in Iron Banner, you build off of that base damage. Level 1 can still do normal damage, but being a higher level enable much more damage output. Just because you can do well at a low level in Iron Banner does not mean it's broken. It means the people you're playing against are less skilled than you.