I suggest a lot of the posters to read the actual article. The study was not about whether the wii gives you more health or not, the study was whether the introduction of a wii into a family would cause people to exercise more. 3 months were spent without the wii, and 3 months were spent with it. And the method of calculation would be on weight,etc..
There are some that state the sample size must be 30, etc... But we should remember that Statistics is a study, and I am sure the student followed his professors guidelines. As a university, I'm guessing they didn't have 30 Wii's sitting around to use, it's academics not the Military.
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As for the basis of the study and whether it has merit, it would be PC World who should take the blame if it was not a proper study.