I've read Watership Down, The Plague Dogs, and a good chunk of Shardik. Plague Dogs is my favorite, much as I love Watership down. Shardik was really good, but my God it's dense stuff. Layers and layers of description. So much so that it might turn a lot of people off. It's a very big world and you're gonna see as much of it as Adams can get in there. I should get back to it one of these days.