Well, I love literate RP, and…
I agree with >>186
for the most part, but I've had RP partners I grew up writing with whose styles never evolved or improved. There was one who I enjoyed roleplaying with when I was 10, but when I picked up writing with him at 19 his style hadn't changed at all. He was still writing the same stuff in the same fashion he did when he was 11.
For me the most important thing is knowing the people you write with well enough to be able to come to agreements and have brainstorms together even when there's criticism. Of course, on the other hand that can create problems. My current RP partner (of six years) and I know each other so well and have such a huge established canon that it's really, really hard to introduce anyone into it even when we want to. Just introducing newcomers to our canon requires an massive encyclopedic overview of the story so far, the lexicon, the universe plus an overview of how it might relate to their established character… which often means that they say "fuck this" and it ends up being the two of us as usual.
I've noticed that this can happen to a lot of literate RPers who pair or group together. They end up with such a long story or canon that it's incredibly difficult for them to bring anyone else into it. This is even prevalent on message boards where cliques form. Sometimes it gets to a point where these groups don't even WANT newcomers to their story, which can lead to larger groups being inaccessible and sometimes downright unfriendly.
It's also really hard for me to find RP partners because I fear I might be an elitist fuck
and I have VERY specific interests as genre and fandom goes, but that's my own fault. Also, I can be kind of a flake and tend to disappear on RPs if they don't engage me enough. It's a shitty habit I'm trying to break. But I really do love an engaging RP.I would love a new RP partner or two to group with sometime. Just sayin'.