Yep. Similar experience here. Don't DPS in WP. Yet. Maybe after they fix it. I tried as RDM with an NPC tank, DPS, and healer. Bad idea. Tank AI doesn't know the WP final boss fight mechanics. At. All. However, as others have said, go healer, ignore the tank on final boss, use engage to order the DPS to attack the King. That's not the way it's supposed to work, but after trying it 10 times (literally), I'm done trying this fight as DPS. Shame, b/c the rest of the dungeon went really smooth. Not the boss. Tried for the full 90 minutes, no go.

Side thoughts -- you want to run a command dungeon as DPS? Don't do Halatali or Toto-Rak either, AI on the bosses are dumb there too. Do Brayflox's Longstop. Or Stone Vigil. AI still needs work in parts of both, but it's manageable -- and much more so than the other 3.