I don't really have one favorite book. I enjoy different things, or even the same idea expressed in different ways. For example, some of Robert A. Heinlein's fiction is as enjoyable and engaging as any literature on the planet, while some of it is complete garbage and/or polemic disguised as literature. The same goes for Frederick Pohl, Orson Scott Card, Frank Herbert, Gibbons, Michael Shaara, Shakespeare, Keith Laumer, James Fenimore Cooper, and others whose works grace my bookshelves.
If you found Lord Of The Rings to be such a lowly tome, then I am deeply anxious to know what class of book you find entertaining?
I don't find LOTR to be all that "lowly" - just inpenetrable and tedious to read. I even have a copy of LOTR on my bookshelf - I bought it in trade paperback earlier in the year, just to see if Tolkien had become any easier to read. He hadn't, but at least I made it to Page 30 this time before giving up.
Except for Decline and Fall of the Roman Empire (which I inherited from my grandfather), I don't have a complete set of any one author's works in my library at home. I tend to buy the works that interest me in some way and dispose of the drek or use it as trade bait at Half-Price Books.