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Of course, I've had people get irked with my role-playing, too -- apparently, it takes to long to speak in complete sentences, and I talk funny.
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You know, that's a really significant point -- dialog is the primary tool for role-playing, and you can't do it effectively if you're focused on communicating quickly and succinctly.
I've built a boatload of macros for my RP-oriented characters for general situations when I'm not in a team but there are other heroes around, and that works pretty nicely, but when you're in a team you really need to take the time to respond to your teammates in-character. I suppose this is a good reason for RP-focused teams -- then everyone has an understanding of what's involved and that they won't get instant responses most of the time.