An interesting topic, one that I have varying viewpoints on. In a way I agree with ebonwoman's statement; chatty RP that is too casual I can do in the real world, and thus my interest in it is slightly diminished. However, that is not to say that conversational RP is negative in all cases. I've had my fair share of more intriguing conversations, which usually involve something deeper. Things like;
* Mariana Xiechai looks down, back up again, chagrin evident on her features. Her eyes take on a glassy appeal, the sorrow in them coming into sharp focus. By some form of inner resolve, she snaps them shut and takes a deep, meditative breath, opening them only when the cap on her emotions has been screwed tightly back into place, and looks up at her interrogator's eyes fearlessly. "That is not necessary for you to know."
If you're talking to someone about their past, about something they have experienced lately that you would typically not come into contact with in the real world, then certainly it is intriguing in its novelty. It's basically the difference between chatting about shoes and having a deep philosophical conversation with someone. The prior will never hold my attention, I'd sooner beat my head against a wall. The latter, however, is fascinating.
That said, I've had my fair share of RP which was far too casual. I do not want to talk about clothing. I could care less what your character's favorite type of food is. Sitting around in the tavern staring at each other and saying "how was your day?" in between dozens and dozens of /me takes a drink of red is enough to drive me insane.
I suppose what it all really comes down to is depth. Doesn't matter if the Role Play is "quote" casual "unquote." Can you hold my interest, and can I return the favor and do the same for you? Are you able to feel what your character is feeling? Is the exchange full of some sort of feeling, or is it hollow? Hollowness is possible in both role play chatting and villainy. If your villain is evil "just cuz" and can shoot lasers from his/her eyes to smite everyone, then please, stop reading so many comic books. If, however, your villain has a speckled past of abuse, neglect, or just running with the wrong crowed and getting into trouble, it's far more interesting. Can I feel empathy for your villain? Does the villain's viewpoint about what they are doing make sense? Even better! Is the villain realistic? Most "evil" people do not truly see themselves as sadistic. Hitler didn't think he was bad, but was he?
Hell yes. I doubt anyone could argue otherwise. Same with Stalin, pillaging vikings, the Huns, take your pick.
Also, vary up your role plays and break out of the "strictly evil" and "strictly good" catagories. The world is rarely truly painted in black and white. Why should your role play be any different? They say the winner writes the history of a conflict. But that doesn't mean that they were a group of morally perfect individuals. Give them flaws, skew their reasoning, twist their motivations. Corruption is a wonderful thing to role play, salvation from that corruption even more so. Marsuveus is a good example of this idea, for instance. Even though he was wicked and did not deserve grace, Teshia didn't give up on him ICly. She didn't run at him with swords waving and banners flying. And thus, the role play developed on a deeper level than hacking at one another to see who could sever more limbs.
At the conclusion of this ramble (which will probably be skipped over as tldr for most;)) Basically I'm just saying that any type of role play can be considered
mature. Not just sitting around chattering by a fire. Both groups can have duds and successes. Pointing fingers and accusing one of being lesser or greater than the other really doesn't achieve much of anything. Learn, grow from each other, and develop things to see where they go. Don't block off an entire crowd just because they like a certain genre better than another. For one, there are too few people here to do that. Just go with the flow, and the back and forth will almost always result in an enjoyable exchange for either party, regardless of what it is they find most diverting.
One last statement:
So, I think we, and those in the kindergarten stage, could learn something from Mariana.
I'm flattered, but I'd like to point out that my actual role play experience doesn't exceed one year. There are dozens of role players who are far better than I, and who can mold a story that interests larger groups of people. We're all in kindergarten, and I'm just coming out of preschool

The only way we experience growth is to be open-minded, and to learn new methods from each other.
An example of such an RPer would of course be Rigwyn. His work is very inclusive, and very interesting, without cliche. If you haven't looked into his thread, I'd highly recommend it:
http://www.hydlaaplaza.com/smf/index.php?topic=40558.msg456897;boardseen#new