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Many here complains MMOs are too easy. Many on official MMO forums complains MMOs are too hard (good example: lots of complains about CATA H dungeons being too difficult and Blizz has to nerf them).
Obviously you can't please everyone.
No longer. D3 is going to get a "monster level" system that you can choose a level of difficulty (1-10 monster power level in D3, but obviously can have as many levels as needed in a game) with more rewards at higher difficulty. The highest level is probably impossible for 99.99% of the players.
It works both in leveling, and end game. This will once and for all, solve the issue. No one can claim the game is too easy, or too hard.
May be this can be used in MMOs, particularly the leveling part, which a lot here think is too easy.