All I care about is furthering and engaging with the story.
Give me something to respond to and keep the story going or it's time to end the RP as it's not going anywhere at that point.
Every other factor is of much less importance.
I am not a grammar nazi, if I can understand it then it's all good.
I am not a spelling nazi. We all make mistakes.
The only other factor that 'matters' to me is length of time between poses. If I am falling asleep because you're taking more than 15 minutes to pose, then I am probably not going to stick around for much longer. I have limited time. Don't abuse it.