I have always hated when I tell a party that it's my first run through a dungeon, and I take the time to ask for tips on bosses, and the only reply I get is "Didn't you watch a video?"

Maybe it's me, but I enjoy going through a dungeon or a raid without knowing everything that is going to happen. I like watching the cutscenes and seeing the mob I'm going to kill in its full glory. I only watch the CS on the first time through, and I do read up on how to beat each boss. I just don't like watching someone else play the whole thing before I have a chance to experience it.

Just my two cents... cheers!