If you want a good f2p mmorpg, try Perfect World. In my opinion it's the best f2p. It's not too grindy, at leats not until the very high levels(the last 15-20 levels are though). And it's really possible to play the game without investing ANY real cash, just time. Anything one can buy with real cash, you can buy with ingame gold too. The bots and gold selling companies are almost non-existent. It has it's bad parts but definitley deserves to be mentioned as one of the best F2P mmorpgs.