On one hand it's impressive and huge and through that is somewhat intimidating and scary, because it makes one feel like losing control (to the "machines").

On the other hand it's a straight-forward extension of a basic calculator. There are tasks that humans can do, but not as fast, so why not automate them? It doesn't mean that no one can subtract and divide by hand, it just makes one's work more efficient. Similarly, Watson doesn't mean that next generation doctors will be lazy incompetent asses at mercy of a powerful computer system. It means that they will have yet another instrument to help them do their job better.