So, there are 3 choices:

1. Action 3D MMO (Dragon Nest, Vindictus, C9, TERA etc)
2. Action arcade style MMO (Rusty Hearts, Dungeon Fighter etc)
3. Good old point n click (WoW, Runes of Magic etc)

Not sure if I should label category 2 as action side-scroller, but you get what I mean~