Wii...To be or not to be?

I also have the Wii. I use Wii Fit Plus. I think it's a very individual decision. I would recommend it as a fun addition to your exercise regimen. A friend who did not have much weight to lose dropped 10 kgs by using Wii Fit Plus. I have also heard good reports on Active and My Fitness Coach for a 'proper' workout.

If you tend to like games and like the idea of mixing up your routine I'd go for it. As you already said, you don't expect to lose weight 'solely' by playing the Wii - so I think it would meet your expectations.

It's also a fun way to be a bit more active when playing games without realising it. Games like 'Just Dance' are so much fun and a real workout when you have friends over.

Investigate the kind of games (beyond workouts) that you may be interested in and it may be a great decision for social, entertainment AND health reasons.

I really love Wii Fit.
The program records your height and weight and you can weigh yourself before each training session. It has 3 main parts: yoga, strength training and balance training. Up till now, I haven't tried the strength training, but I'm going to start since I'm on a diet now.
I really love the balance games and the boxing game. I usually don't think I'm doing much exercise, but after about 20 minutes I start to work up a real sweat. It's good cardio!
The game records how long you do activities, not how long the game is on, so it's very useful for figuring out times for your exercise diary.
I don't think you could lose a lot of weight from doing the Wii alone, but if you mix it with other exercises, it's a great way to help burn calories. I'm doing it on my off days from pilates and weight training. It's so fun that I don't feel like I'm doing any exercise at all. Recommend it all the way!

Wii Fit is especially good for people who live in areas where it's not easy to exercise outside because of bad weather, bad neighborhood, no money for the gym, etc.
Our experience was it was a fun family activity to do in the evening after dinner. The balance games are fun and good for strenthening your core. We also liked the games where you had to match their movements, we had great fun watching each other and competeing.
The down side is it takes so much time waiting for the new screens/games. The other thing is over time it (like most things) get's to be routine and my son lost interest.
I found it to be fun and good to have when other exercise isn't available.