As a Gm:

I expect some thought to be put into the character and how he or she has been developed. I may be able to post a sheet of ridiculous size for a casual player in only a handful of hours if that but others don't have that level of skill or time on their hands. So to that end all I ask from my players is this: Have a character that's able to fit into the roleplay that isn't some poor cliche character and isn't a complete loner. Likewise posting requirements reflect my ideas about a couple paragraphs for the CS while in IC posting can vary but I like to see at the very least a paragraph and a half.

As a player:

As a player I only join roleplays where I can work together with the GM to form a coherent character that will fit into the roleplay. Likewise I don't want to be talked down to like a noob. I don't mind someone pointing out mistakes but when people start questioning how I post (long paragraphs and the like) that's when I start to get a bit annoyed. I will space things out if you ask me too and even shorten my posts or lengthen them. But do I REALLY need to explain to someone how my character isn't screaming when there is not a single exclamation point in the entire post? Likewise I want other players to follow the rules and don't try to shove themselves into the main character spot unless they are the current focal point in the roleplay. Someone dogging for the role as 'protagonist or main character' are people who don't understand other people don't join a roleplay to become a side character normally. The player characters should all get equal attention unless someone is specifically meant to be the center of attention in roleplay at the point in time.