I used to play this on the Japanese servers during its beta period. They had it as "Fantasy & Romance Online."
Anyways, about the gameplay. It was really fun at first. Almost everything you hit will drop equipment, which you can use to sell and get rich pretty quickly. After you hit level 27 or so, it starts to be a real grind. At level 30, you get to select your second class. I was a Cora summoner cause I thought the Animus looked really cool. After level 30, it's a real grind. They restricted the level to 32 so you can't go to other planets. Also, during the battle for the core, the Bellatio (humans) had a great advantage because they get to drive a mech, which has an insane amount of hitpoints.
The stat leveling was rather unique. Basically, you can level up any stat as long as you use the specific equipment that affects that status. Another interesting thing about the game is that you can be dual classes. What I mean by this is that you can start off as a warrior class and once you hit level 30 and change to your 2nd job, you can pick any job because they're not class restricted. The quests for this game was really simple as well. Once you hit the level, your headquarters will message you about the quest for that level and you can just pick it up then. Usually, the quest is to kill x number of creatures at your level.
What I liked about RFO is the battle for the core. Two times every day, the 3 races try to destroy each other's tech tower thingy for control of the core. It's complete random chaos and really fun

Once our race wins, they get access to the core and can mine for ores over there at super fast rates (ores can be upgraded to talics, which are used to upgrade your equipment).
Overall, I think this was a fun game. Not the best, but worth playing.