I'll be honest, for Light Party type of dungeons, which I equate to 5-mans in WoW, I'm not going to bother reading up on a fight. I think expecting people to do that is just silly.

For raids, which I suppose are the 8 and 24 mans in this game, I not only will read up on the fight, I'll read up on my role, watch videos, theorycraft damage numbers, etc.

Save the extra work for where it belongs, not on the easy stuff.