Okay then, so people are concerned about not having time to participate.
As far as minimum post requirements go: the main key is getting actions in combat out in a timely manner. "Timely" would mean within 48-72 hours of initiation of combat or a new round. Just throw your actions together: no need for a description if you don't want to.
As far as the actual roleplaying component, I know that not everyone has the time or the motivation to put in detailed posts. I won't hold that against anyone: just make sure you indicate you are ready to move on when your character is in a roleplaying section.
@dil: As far as whether or not roleplaying is fun, it depends on the player behind the character. Do you like creating a character, developing them, and responding to new situations? If so, it probably is.
Another way to decide: Do you like D&D or not? If yes, you like roleplaying (most likely). If no...you either don't or don't like the combat in D&D (or both). At the very least, combat is not dominated by luck here (though there is a little bit of luck).
"Beginning is easy - Continuing is hard."-Japanese Proverb