So I've had my first RP Mission together with Arufa and Ilunga being assigned as Team #1 with Zintosso as our captain. To be honest, I've thoroughly enjoyed taking part in these type of missions. I'd much rather spend 30 minutes RP'ing than doing a mission grinding and repeating the same thing over and over again. This creates more diversity as it also requires nice improvisation made by the Chunin captains.
To quickly summarise how our RP mission went:
Team 1 was assigned to go to the Training Area Field in order to sharpen their combat skills due to the crucial and dire situation the Leaf Village is in. Before the training began the team first had to introduce themselves talking about their past, ninja aspirations/dreams and their specialties. After this Team #1 proceeded to have a Triple Threat sparring match. No Jutsus were allowed at the first half of the training. Fatally injuring or killing was against the rules. Although Shirou somehow accidentally managed to fatally injure Ilunga during the second half of the training. Luckily our medic Arufa was there in time to heal her up. After successfully completing the training, the team head back and reported to the Hokage and finished their mission.
So I believe this brings a lot diversity towards the game, which definitely makes it a lot more enjoyable for players to interact with other players. Overall I think the exp gain is fine as it is. (13.2k exp for 30 minutes of Roleplaying would almost be equal to actual 30 minutes of grinding)
The only thing I've noted however is that the assigned leader/chunin does not gain exp for helping out on an RP mission. It would actually be nice if the leader would get at least one third of the exp originally given from the RP mission in particular. Or at least a slight portion. I think it's a bit unfair if Chunins/Jounins constantly have to do charity work for Genins, especially since everyone will be asking the very few Chunins that we have to assign them on a mission. Of course leaders have the right to accept and refuse on their own behalf, but I can expect Chunins being rather committed to their ranks and take their position seriously.
Last thing to mention though, I am rather concerned with the exploits of RP missions. One player could drag out a mission longer than 30 minutes, as another could try to cut corners and shorten it to 10 minutes. Now obviously if someone decided to repeat this process to power level, it could turn out to be a disaster. So there needs to be some sort of regulations towards that. A timer would be nice for example.