mixed classes would rock!too bad nobody's smart enuf to make a game with em yet.
i also dislike that,when you choose a class,you gotta kick ass and collect like 10000 somethings.BORING.
also, classes.all the games have rangers,buff-machines,mages and swordmans.NOTHING interesting.
the fact that if you find a place where monsters cant reach you,you can't shoot em with your bow!wtf?!
and ofcourse i'd say,that,NO MORE MEDIEVALS!someone make a time travel(you can play sci-fi,fantasy,and in your own times) mmorpg and it would plain rock.imagine a knight pwning hitler =DD
or a spaceship fighting a dragon...
unlimited possibilities...
also,THE WORLD.too small.most world are a bit of forest and ~4citys.
also,you die if you walk in water,or theres a invisible wall right next to the water.(Xept WoW)
all i can think of