Wiifit on its own will not make you fit
I don't think Wiifit on its own is going to get anybody in shape. But it's more fun than regular excersise and if you added it to something else to keep in shape like lifting weights, walking or going on a excersise bike ect, then I think it is beneficial and promotes a healthier lifestyle. But buying Wiifit isn't enough, like any excercise you need commitment. Already a lot of people are no longer using Wiifit, it was just a novelty for them and to much hard work, to much like regualr excersise for them (boring). If you want to lose weight eat less and walk more, it worked for my brother, add Wiifit to things like that if you wish, it can only help I guess. Or it may be the first step in changing the way you think about your body and your general health, so I guess there is nothing wrong with Wiifit, it probably just shouldn't have been called Wiifit as it will make people believe it's going to drastically change their lives, when on its own it's not. Being fit and staying in shape is hard work and requires a change in attitude and eating habits, and serious commitment. It comes from within, Nintendo can't make you fit, only you can.
Onto the games, I've seen some silly people sayy there are 4 games in Wiifit, what they mean is there are 4 categories, and all together about 40+ activities in these 4 categories. The 4 categories are
Yoga
balance games
aerobic exercises
muscle workouts
You can only access a lot of the activities after playing for a certain time or achieving a certain rating on a event.
I wouldn't think the balance games would make you fitter, but the muscle workouts and aerobics should work as they do push your body and get those muscles working and your heart rate up. Some are very hard, some easy, and your scores for each game can vary alot and do not seem accurate sometimes. I was told after my first abs workout that I had great abs, yet I have a belly on me... best not take the results to seriously, just try to have fun with it. As with any exercise, you need to put in the time to get results, there is no quick fix. No free rides as they say, if you want to get fit expect to push your body, it's not easy, and many people will not find it fun.
Some of the workouts such as yoga and muscle workouts really don't seem to need the Wiiboard very much as it's basically a instructor on the screen telling you what to do and you copying him or her , more like a excersise video than a video game. It's the balance and aerobics sections that use the board something like Wii sports, and are more fun and kid friendly, but again, not sure if they will make you fit, only time will tell. Things like snowboarding, boxing, jogging, are kinda fun, but this is a exercise tool first, people seem to forget that and go in expecting to have a laugh with it like Wiisports, it's a lot more serious than that so it's best you know that now before you buy it and complain it's not like Mario Galaxy or something,.
I'm just starting using Wiifit and have put in about 25 minutes a day for a week. Used daily or every other day, I guess it will help people to feel better about themselves, and may help them to look into other, more serious ways of keeping fit and living healthy. The Wiiboard is a quality piece of kit, heavy, can take a pounding, accurate. the Wiifit software is full of graphs and stuff for you to keep track of your daily progress and your weight ect. If used properly and regularly I could see people getting a lot out of this, even if they don't lose much weight or get very fit, I'm sure it will keep them interested and get them thinking about their health more. Which is only a good thing.
I'm glad I bought Wiifit, just don't buy it expecting miracles, it's not a video game, it's more serious than that. Does it work?, I don't know, only by putting in the time will people find out, and the results will vary greatly depending on other activities you do in your life, and what you eat ect. There is nothing wrong with adding wiifit to your daily routine, but on its own I don't think it's going to get anyone fit. If you want to lose weight, watching what you eat is more important than using Wiifit. If I had to score this thing I would give it around 8/10, it's well put together, and is the best you can do with a fitness video game I guess. Just don't expect it to be a miracle cure for anything, as it's not. If you are trying to lose weight or get fit I wish you good luck, I know from friends and loved ones ( my girlfriend is very overweight) just how hard it is to lose weight, and how much of a effect being overweight can have on your happiness and confidence.