Seriously I would bet a vast majority of players have not got a clue about topics of major lore events. Whilst I don't have a problem with this it makes me curious why blizz puts so much effort into story and lore of expansions when most dont really care. All that seems to matter to these players is how much better they are than someone else or how much loot they get.
Take the cinematic post DS. I would not be surprised If most didn't have a clue what was going on and simply skipped right past it to get their loot and run.