Oh, how I miss hearing this from Oblivion...
I've never played Oblivion, but reading the thread title made me immediately think of the common greeting dwarves use in WoW.
I really miss the guards in Oblivion yelling 'Why won't you die!'
Bandits and Forsworn use this phrase.
Otherwise, I agree that there seems to be little in the way of social greetings in the game. "It's a fine day with you around," or, "You look like someone who can get things done. I like that," are okay once, but a simple "hello" would suffice. And those guards and their, "What is it?" which becomes, "What is it? Dragons?" after you kill a dragon.
Oh, there is one thing guards say that makes me chuckle: "If I find your hand in my pocket, I'm going to cut it off!" Cut what off? My hand? Your pocket?