Actually in all honesty part of the big problem was the whole SP system they instituted, the game was designed around a whole different mechanic, and enemies made more sense. As it is, enemies exp value doesnt reflect thier difficulty. This has lead to the game seeming too easy. Before you went out to fight difficult monsters because the reward was better, or because they fit the playstyle of your team. Parties of 15 people used to be able to get great exp from a tough fight, where smaller groups were able to get competive exp from a fight that felt just as tough for the the smaller team. heck properly built two man parties could pimp the exp, if they had teh right mob. Oh it had problems, but the whole game was designed around it, monsters made so much more sense. and you could have relatively long and rewarding fights.

But that is gone, and now we have to try to balance all the exploits, we are back to having to getting very little benefit for fighting difficult mobs. Also since now regular mobs are generally bad with exp, the only way to get good exp is by doing certain leves, A lot of problems are coming from trying to totally change only 1 aspect of the game, The current sp system makes the game super leve centric, and doesnt actually help casual players much. but oh well, its here now.