I must be one of the lucky ones: I'm playing in two BB PbP campaigns, and both are going quite well.
Compared to tabletop games, they are indeed very slow.
However, I'm an old 1E guy and I need to learn the PFR rules and Golarian setting.
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But .... this slow pace is an advantage for the GM since he/she will need to provide ample detail (maps, NPC personalities, plot).
I think the most important thing is honesty:
- During recruitement, be up-front about how often you can post.
- If you're already playing and need down-time, let the GM and other players know in advance.
- If you get mad at a fellow player, let him/her know it and work it out.
- Take Paizo's advice: Don't be a jerk. This is a game; it's meant to be fun.
Thanks,
Keith