At least now with a digital camera I get the chance to pre-view the results. Some years ago I set up all my gear in a local hall to take some promo photos armed with a 35mm camera & 4 rolls of film. I used different aperature & speed settings to experiment & didn't get a single decent photo from all of them!!
I'm still trying various options with the digital and it seems to work better if there's some natural light (but not too much) in the room &, as Spin says, use it without the flash.
The photos on my web site were taken using a borrowed digital camera set up in front of my TV whilst playing back a video of the night!!! Not the best way to get quality but it worked as a stop gap (2yrs ago).
Paul S