I use Goodreads to maintain a public bookshelf of books I have read or want to read. It's also nice that I can check what my friends are reading. Occasionally it's nice to read other people's views on a book. I typically tend not to agree, but it's nice that these exist.
That's it. Isn't that what Goodreads is about? Seems like a nice website and perfectly suited for what it does. Am I missing something?