Ultima Online, while he digs the accessibility and pick-up-and-play nature of more recent titles such as World of Warcraft and, presumably, The Old Republic. About the only thing we could agree on is that there's room for both in the massive genre.
Realism is highly subjective. For example, a fantasy title full of wizard fire, dragons, and goblins (Ultima Online) is, in my mind, more realistic than a non-combat sandbox based on "real life" like A Tale in the Desert.
What say you, Massively readers? Would you like some realism with your MMORPGs, and if so, what exactly do you mean by that?