The thing with Watson is that it was specifically built for one purpose, to understand a question and pop out the answer. Due to its processing power it's able to sort through vast quantities of raw data and pick the answer faster than a human can. Despite all that it still isn't even close to the ability of a human brain.
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Watson had access to 200 million pages of structured and unstructured content consuming four terabytes of disk storage,[8] including the full text of Wikipedia,[9] but was not connected to the Internet during the game.[10][11] For each clue, Watson's three most probable responses were displayed on the television screen. Watson consistently outperformed its human opponents on the game's signaling device, but had trouble responding to a few categories, notably those having short clues containing only a few words
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All the "knowledge" Watson has is just information stored on a hard drive. The innovative thing about it really is the voice recognition and how it picks out key words in the question to identify what it needs to search for.
But it cannot come close to the human brain when it comes to problem solving. A human can look at a problem and come up with a solution to it with no prior knowledge of the situation. A computer such as Watson can only give an answer if it has been programed to recognize the scenario and give a certain response. Self-learning computers that can mimic a human brain are still a ways off. Until something like that comes along computers such as Watson are nothing more than fancy search engines.