You're right, Jeopardy questions are much more contrained than standard, domain-based questions; however, as the article also points out, these constraints may

You're right, Jeopardy questions are much more contrained than standard, domain-based questions; however, as the article also points out, these constraints may be very hard for the computer to pick up. In fact, the main reason that Watson is slow compared to humans competing against it is precisely this, that it cannot effectively prune the search space in most cases. Look at how the answer to the Michael Jackson video is generated; the final answer is correct. The runner ups are also relevant but in a very weird sense, surely nothing that a human would come up with.