We see a lot of MMORPG's out there that follow the linear formula aka lvl 1-100 and few talents or attributes you just put (dex/str). I personally love MMORPG that make you discover the "OP" way either through experience or in a way unlocking it through the game. How many MMORPG's we got with such system atm. I am honest at least and every vet knows that there is no such thing as "balance" in a multi class system. The balance though is more in "how far" you can go and do with one character against "others".
I know EVE has complex ship/chr development. Any others MMORPG's out there where you can take at least 3 decently gear/skilled players by yourself with ease atm? I like to go far in a MMORPG and shape others gameplay experience in it.