This rant actually represents a fair portion of my beef with high fantasy. Looking at the fantasy at my local bookstore, I see that the plots are all basically the same - person goes on quest to retrieve Mystic Object and slay Ancient Evil for great justice, Mary Sue rebels against patrical/mysogynistic/homophobic establishment for great justice, and so on. If you go outside fantasy (and romance, I suppose) you find a much more variety. Mainstream fiction goes into all kinds of topics, such as stories about artists, philosophers, scientists, and just regular Joes. Hell, you already have a fantastic world, why not write about a regular Joe (or Jane)? Fantasists have so much to work with and do so little to exploit it.
By the way, is there any chance you could do a rant on antiheroes? Antiheroes in the sense of "characters with less admirable motivations, qualities, and personalities." I'm very curious to know your attitude on this type of character.