AV is only difficult because there are a lot of players that just don't know what to do or where to stand in that dungeon. Even explaining the mechanics, you can still be in for a bad time because the bosses are pretty specific with regards to positioning and things in order to maximize heals and to deal with debuffs like Burrs and Gold Lung expediently.

I hate it for that reason. It's a pain as a healer to run in DF. It's not hard in terms of straightforward difficulty, it's just hard because you have to be pretty precise in how you handle the bosses.