War of the Immortals
This game (My opinion)
Is really the only free RPG I've actually stuck to in YEARS, and I've played just about every free mmorpg over the past 4-5 years.. Battle of the Immortals was great, War is even better. Definitely recommend this game to anyone seeking a good, simple rpg :D Leveling system is perfect, fast leveling until about 65-70 then it's kinda slow which is good balance for me (: