there are two core type of massively Multiplayer Gamer,

1. those who strive for gameplay, these type of people go on and off the same MMO, in which he/she will stop playing when they achieve the patch goal or their personal goal and continue to play when a new patch hit, because they want to get along the storyline. These type of people don"t mind shitty or aging graphic but instead demand for a great storyline or gameplay system or lore.

2. Those who wanted a pretty game, pretty much boring individual who switch between one MMO to another when a newer, better graphical looking game releases... don"t give a fucuk about lore, as long as they can get a pretty /cyber.

None

believe me i play enough MMO and being a beta tester of enough MMO to always come back to WoW, still... rule of thumb when playing free MMO... find one which is casual driven rather than lore driven... because there are no MMO thus far which remotely close in levelling friendly against WoW.

some casual driven MMO are mostly korean made;

you can try AION if you never play them, their lore is shit but at least the game has become F2P with premium as of recently.