Sorry, lost initial post so this will be a bit quicker and to the point. I see a lot of threads about difficulty of leveling in WoW and the ease of it. I also see complaints about the world not being threatening enough anymore. I think we should implement Diablo 3's Monster Power system to help this problem for those who want to fix it. The beauty of the MP system is that it can create a more dangerous works but is entirely optional.
I think the MP system in WoW should take effect the moment you hit the mob, increasing the mobs damage/HP according to the set modifier. I also believe the MP modifier should affect the mob's abilities and drop rate to make it more enticing for those who use it.
An Example: Mob - Defias Pillager
MP 1: Mob behaves exactly as it does now.
MP 2-3: Mob has increased HP, damage and drop rate for set MP level.
MP 4: Mob learns Blast Wave which knocks back enemies. Mob has increased HP, dmg and drop rate accordingly.
MP 5-6: Mob has increased HP, damage and Drop rate for set MP level as well as maintaining MP 4's new abilities.
MP 7: Mob learns Frost Nova and Blazing Speed. This allows mob to put more room between it and enemy. Increased HP, damage and drop rate accordingly. Frost nova would not hold for really long at this level.
MP 8-9: Mob has increased HP, damage and drop rate as well as maintaining MP 7's new abilities.
MP 10: Mob learns Living Bomb, Counterspell and Fireblast. This increases the burst of the mob as well as the ability to shut down casters. Counterspell would either have a short cast time or short lockout to not completely wreck casters. Increased HP, damage and drop rate accordingly.
I would love to see this in game and would love to what you think. With the additional change to people assisting you to kill a mob, this could make for quite a bit more exciting kills in the world.