There is an award at the end. Once you finish the last quest you can either choose a slayer deed increaser, a skill deed increaser, or an +10% xp from quests and kills for 6 hours tome thingy. Easy quests to do if you want one of these. I would suggest doing them.
1. This is one of my top three favorite quest chain in the game in terms of story and writing. You'll start to see how awesome it is once he sends you to pick up turtles from the hobbit. (Other two favorites: The "Black Rider" chain in Budgeford and the festival chain "Covert Reparations".)
2. I expected a cool title, which didn't appear, but I was quite satisfied with the rewards. Everyone needs deed accelerators, if nothing else.
3. At the end, you get access to a pretty awesome house. Like, cool enough that I'd throw in-game parties there. And if you turn up your graphics, it's even more awesome.