tell us what it is in your head.
My ideal game is one that revolves around the players. Of course it has to have decent game play, intresting settings, and frequent rp. However the biggest thing I want is a game that is literally like real life in the way that what one player does can change everything. I like the idea of settings to play by but only as background history. I want a game where what a player does is just another piece of recorded history, we each can affect the world around us.
So where am I going with this? Lets say we had a game and within the game we had cruel tyrants ruling the country. I could choose join these tyrants, maybe oneday becoming an equal to them. Or maybe I could be the one who takes down the goverment itself, killing all of these evil rulers. Then who knows what will happen. Maybe I will be able to rule, maybe the other players will rebel agaisnt me, maybe the leftovers of this old kingdom will take me down. What happens in the game is left completely to the player. Maybe I'll just be a merchant all my life. They can fight their wars but I want no part of it. So I just sell my goods day by day. Maybe I'm a spy, attempting to infiltrate an enemy organization. Maybe I'm just a humble guild leader/member. I could be a bartender.
In other words I want a game that is pretty much commanded by the players who play it. There can be 2 rl years of war for power in the game and suddenly it becomes peaceful till someone is able to murder the new leader. Pretty much no rules, no limits to what you can do. Your given a setting and you play.
The perfect MMORPG is just outside your door 
RL works too though. However I doubt I'll plan to become an evil warlord and take over the American goverment anytime soon.