The original Wii Fit was the pioneer in the fitness game craze. Shortly after, Nintendo cashed in on a revised edition called Wii Fit Plus which extended the quantity of mini-games and exercises, as well as making a few tweaks. Now on the Wii U, Nintendo yet again revise the game and relaunch it as Wii Fit U.
In this edition, the graphics are now sharper, the trainers have had a slight redesign and there's a few tweaks to the UI. There's even more workouts, a dance mode, a personal trainer mode, GamePad incorporation, and a new gadget; the Fit Meter which is a fancy pedometer. For newcomers, it's a great edition, but for returning fans, it will feel far too familiar to justify a purchase.
It's easy for people to assume Wii Fit's idea of fitness relaxed, focussing on stretching and balance. That's not to say it's not tiring though, some mini-games sure fatigue you quickly and raise your body heat.
As far as Miiverse integration goes, you can join Gyms, which populates your screen with other member's Miis and you can check out their personal, or the group's overall statistics. You can also set it to post every time you play which is a great way of spamming your news feed. Both features I found to be quite limited.
Playing the game can be quite fiddly. You will have the balance board on the floor, and often alternate between the GamePad and a Wii Remote Plus. Some games even require two Wii Remote Plus controllers, which means you will need 8 AA batteries and a lot of space to experience all the features in the game.
I think the quality of mini-games vary a fair bit. Most of the balance ones are fun, the strength and yoga ones give you a decent workout, but the Aerobic ones seem a bit impractical. Exercises like Step make sense, but the Jogging ones just make you run on the spot for long periods of time which is probably bad for your posture.
You can choose individual games yourself, build your own routine, or ask the game to generate a routine by selecting categories, a time-limit or a calorie target. One minor tweak which I used frequently was the fact that once your current exercise is complete, two suggestions appear on the GamePad which gives you the option of quickly moving onto a new exercise without going back into the menu. It's a minor tweak, but improves the usability of the game.
For me, Wii Fit U doesn't advance the game enough to make it a worthwhile recommendation. Nintendo should have made this into the system-seller the original game was, but it feels more like a cash-grab and already feels a bit dated. To be fair to Nintendo, they did have the offer of the month's free trial, which could be made into a permanent game if you purchase the Wii Fit Meter which can be acquired for £15. For me, I happily enjoyed the game for a month but don't feel inclined to play it any further.