RP in this game is quite good in-fact, even if FRC does not always concentrate on the roleplay aspect. We may have the occasional event, but we use ventrilo fairly heavily, and therefor we usually leave the RP to our machinimas.
From a scale of 1-10 though, compared to other MMOs, with 10 being the best potential for RP and 1 being the least, I would seriously consider putting Mortal Online at a 9 or a 10. A lot of the game's content, well let's not be shy, the vast majority of the game's content revolves around the player's themselves. In otherwords the game world leaves a lot of room and freedom for a player to roleplay anyway they want. Heck the way they market the game and the way it is set up, I would say it is encouraged to a degree. The game leaves it up to you, how you want to interpret the world.
You make a character and you are largely thrown into the world. Trial by fire as they say. Leaves a lot of room to roleplay.

Also if you do wish to join the FRC, you can apply with us by using the "Apply to Guild" link at the top right of the website. We are currently established in the beta and would welcome you into the clan come the start of open beta tomorrow, pending your application and interview.
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