I think it would be kinda cool if the game kept a record for all your stats in each zone or mission that you are in. It should keep track of the amount of damage given/taken (including pets, spirits, minions), amount healed, enchantments casted, number of interrupts, etc.
You should be able to compare you stats to the rest of the team to see how effective you were so you know to change your build if you dmg output is low and you're a fire ele, then you know you need to change something.
Just a thought, what do you guys think?
S

Always wanted to make a big Wall'o Text