We have the Wii, Wii U, Xbox 360, PS3, DS XL, DSi, PSP. Old gamer dad, 13 year old daughter who games infrequently.. Mostly the Kinect/Dancing games. 11 year old gamer son.
The Xbox gets used the most, PS3 gets used for netflix (because of the tv its hooked into) and blurays. DSXL haven't seen that one picked up in awhile.. DSi, very rarely. PSP barely used since it was bought, except for some good titles like God of War.
The Wii U has some cool features. The tablet works much better than I thought it would. Some of the games are pretty fun to play, especially the party games where the tablet has a different view. As group play, its probably been the most fun of any console. However, it gets old quick. I think its been a couple of weeks since the Wii U has been on.
I think the Wii was under powered, especially for first person shooters. I think the Wii U has enough power now so that the console can "keep up" and they can focus on game play. Quite honestly, I think the graphics on the Xbox PS3 are fine. The processors are fast enough to provide smoothly play. I'm really not sure what these new systems can do other than make the games prettier. They certainly aren't going to fix the horrible spawning issues in CoD. The maps only seem to have gotten smaller.. No decent MMORPG multiplayer seamless worlds that require extra horsepower, etc.
IMHO Nintendo should have waited and released around the same time, or shortly before with a beefier system for the same price its offering now. There are plenty of one console households around. Your not going to get them to switch until they see what all the systems offer. If at that point the Wii U is slightly less powerful but cheaper, then you may have people switch over to it. If its popular, then common titles like CoD will probably be developed based on the least powerful system, so won't matter if the other consoles are better.
If the new consoles that come out aren't that much more powerful than the Wii U and the Wii U has most of the games, then I won't buy another console. If the next generation of games can't be played on the Wii U, then I'll be buying an Xbox or PS4, not both this time. I think its a gamble for Nintendo because as we have see with the Wii, casual gamers don't buy alot of games. If the Wii U can't play the next gen games then I think its long term success is dismal.