Hamilton, one of the biggest problems with a P2P design for a MMORPG is that of keeping a persistant world. Also, with a MMORPG, you want to make sure your game world is secure. In a P2P network, you are trusting the clients too much. The clients are your least trustworthy part to the whole game since they can be hacked. People will try to cheat in-game by modifying packets, changing files, etc. If the game were P2P, then this could open up huge problems for security.
I've just skimmed the top of this topic. Once we get to the stage of our server design, then this server topology will be considered.
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Co-Founder & Consultant Project Wish
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