I don't own many fitness games and I am not heavy-Set so I am not the best person to answer this as I don't really know...but seeing as nobody else wants to post I will.
Well, I only have Wii Fit/Plus, & Wii Sports/Resort that can really be considered Fitness games. I have played Just Dance at a friends house as well as played Kinect Adventures.(Not that K.A is an exercise game but I just named it to say I know how Kinect works)
With my experiences, all 4 Wii games that I own(W.F,WFP,WS,WSR) can make your heart rate go up...but like anything to do with moving around your heart rate is supposed to go up. As I said I can't really say if they can help you lose weight but IMO I honestly don't think its the best method to lose weight though it might make you healthier because of cardeo exercise. Kinect I would imagine would be the same way...will get you moving around but won't be too effective in losing weight.
IMO both the Wii and Kinect are fun ways to get moving but if you are serious about losing a lot of weight then I would try someting else. They are mainly fun and not working out equipment.
