Erm, that is a hard one. I guess which ever I have time for. Story line means I get caught up in it and won't put it down because I must know what happens next! Game play is when I like to destroy someone in as many ways possible before time is up (Street Fighter) Graphics I know for sure is what sells in games now. A friend of mine predicted that in the future, as long as games had insane graphics, then no-one would care about anything else because they are looking at all the detail. He's right (Assassin's Creed, Oblivion, AVP).
On another side of the table, why does COD put you to sleep? My fastest beat was COD5, Veteran setting, 11 hours.
Have you ever had a power outage before you could save your game?