We got the one on Napa. It wasn't that bad. There were two of us at first. It was going well until we got it to about 1/8 of its life then it spawned more. Before you attack, get his health bar and keep it in a safe place. At one time we had probably 10-15 ninja strangers. The only way to tell the real one is to get his health bar. Beware of his wirldwind attack. It will kill you even if you pass close to him.
Once we got about 10 people it went well after that. Two warriors got on him with weapons and beat it down pretty well with cross heals and heals from mages. The one is Destard is way tougher than this one.
There were no dragons in the area so I dont know how they would do against them. I was wondering if they would do good, because the dogs did well against them until they did the area affect and killed the tamers.
The loot was the same, nothing worth keeping. This one is fun if you havent been to one, this one is a good one to go to.