You might enjoy Eco. It's not quite an MMO, but it is a multiplayer game that can have large server populations where everyone must work together to advance through a collective "tech tree". It starts very similarly to a Minecraft playthrough, but has a much deeper cooperative progression of advancing different trades and resource gathering methods until the server can construct a laser cannon to destroy the meteor en route to impact the planet. There are also pollution and environmental mechanics, and diplomacy and collective governance. So you may have a player who produces lots of ore, but poisons the oceans to do so, and other players can collectively lobby to restrict that through the government. But at the same time, everyone must rely on the production of ore to further advance the tech tree.
It can be a lot of fun with the right group of people. There's also a lot of flexibility for adjusting the game's parameters, so you can make it work with 2 people or 20 so that everyone needs to work together but the tasks don't seem insurmountable. It's one of the most novel and interesting multiplayer game concepts I've played in recent memory.
It can be a lot of fun with the right group of people. There's also a lot of flexibility for adjusting the game's parameters, so you can make it work with 2 people or 20 so that everyone needs to work together but the tasks don't seem insurmountable. It's one of the most novel and interesting multiplayer game concepts I've played in recent memory.