legendary makes a decked out alchemy, enchanting, smithing build more fun. Letting people set legendary skills back to 15 and giving them perk points is overpowered though.. I got a lot of perk points back putting smithing to legendary, and put those points into illusion and restoration... on the other hand, it made the game quite enjoyable now. high sneak, conjuration, illusion, restoration, with highly enchanted gear and previously smithed legendary armor... that's what legendary difficulty is good for. Even then, without a high sneak and the ability to go invisible, there's still plenty of danger if you get ganged up enough on... there's ways around that too though.. the calm spell in the illusion tree for an illusion user.