I don't really know how most people view advanced, but, here's what I'm expect from people:
Well-developed characters, fluid posts (length is irrelevant), and, most importantly, maturity.
I want to know that my cast won't need to be coddled every step of the way. I don't want to be the "mother" of the group. I want to be able to moderate it. I want to be able to address and handle problems without fearing negative backlash or needless tantrums.
Essentially, if I see someone is breaking game mechanic (meta-gaming, circumventing the world, etc), I am going to shoot them a message and ask them, politely, to stop, etc.
Moreover, I want people to be able to take initiative. While I will be gently guiding the group along a major storyline, I want players to plot amongst themselves (decide relationships, figure out small little clashes, etc) and ADD to the story. Give it flavor, spice, and make it YOURS. You know?
You don't have to be able to write godly posts to qualify (writing is a learning process and practice will make you better), you just have to be able to give me your best and not spiral into tantrums when I ask for changes. (:
I mean... I'll never be unreasonable. I think. And, if I am, poke me in the face... with a fish. I'm a nice person, I think. Haha.
BUT YEAH. I DIDN'T EVEN KNOW IT WAS A STEAMPUNK THING... I'm so bad with these genres... I had to wiki it and everything and feel like a total scrub. ;_____;