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Looking at all the threads and discussions about mmo features (Ex: themepark VS sandbox, group play VS solo play, etc), i came to the conclusion that the fundamental opinion from the people about mmos are only two, with all the other opinions and visions derived from these:
1- People who thinks that mmos should be "simulators" of a world with "realistic" human interactions (like politics, economics, military, etc)
2- People who thinks that mmos are, before and above all, only games like any other and should provide "fun", distraction, satisfaction and entertainment without necessarily tring to simulate "realistic" human interactions.
The people from group 1 usually prefer sandboxes features, while the people from group 2 prefer themeparks. Obviously, there are many that prefer both in different proportions.