They scale damage for PvP. The only real difference between exotic and common weapons in The Crucible are the different upgrade trees that each weapon has access to.
You're not wrong there, but supers are in all guardians possessions. They are defensive, and offensive! No one knows who has one until they use it which makes for a surprise around every corner. Supers can counter each other, even though they are insta-kills there is some balance that exists among them.
I just mentioned how it looks unbalanced. Bubble shields were bad enough now we have body slam abilities that kill anyone in the area? Unbalanced.
As for weapons, I figure people with different levels are gonna have better weaponry and armor. I can work around that, if it were a problem.
I'm not saying I won't like it. I just really don't know what to expect from MP.