Maplestorys stat and equip system! discussion! how would you change it?

What if we replace the damage a monster deals. For example, the base damage of a monster is halved, and the monster gets a chance to hit a Critical Hit which does the full damage. The Crit chance depends on the level difference between the monster and the person who's hit, and can be lowered with w.def and m.def (depends on the attack). It works a bit like avoid, but you can't drop it past for example 5%. Also, Nexon can release a class with a party-skill which can lower the crit-chance to 0%. This way, on normal monsters you get less damage overall, but you still need the HP you need now to survive the crit-hits. In parties against bosses like Pink Bean, that new class becomes almost mandatory for ranged classes to avoid Crit-hits at all, and make them be able to survive them without HP-washing. =)

No idea if it's a good idea though, just something that popped in my mind.