Wii u is not next gen because:
1. It does not bring anything new to the table. Neither horsepower, nor innovation.
2. Uses old gen tech with no advanced features.
3. Has no hardware support for advanced coding standards (HSA).
4. Lackluster title line up with no major 3rd party support.
5. Lacks the capability of running next gen engines.
6. The games themselves lack maturity.
First off, generations are determined by time and not specs. I'll refute most of your points anyway.
1. The Wii U brings plenty of Innovation to the table. Exhibit A: The Gamepad. It offers plenty of awesome new gameplay method and brings asymmetric multiplayer to the forefront which is a lot of fun. It has ultra fast real time video compression and ultra low latency streaming between the console and the gamepad.
2. The hardware is not old gen. It has greater horsepower than the PS360 at a much lower power draw(~30W vs 100W - 150W). A lot of R&D went into miniaturization of the chipset. (Unless you believe that the Pentium 3 and the ARM Cortex A9 are in the same gen. ofc)
3. I'll give you this.
4. I've pointed out that it has major 3rd party support time and again (Unless Ubi, Acti, Disney, Warner, Atlus, SE, Sega, Nippon Ichi, Capcom and Namco are not major). The first party lineup is anything but lackluster.
5. Are you implying that Cryengine 3, Unreal Engine 4, Unity 4, The MT Framework etc. are not next gen?
6. (not counting multiplats)TIL Bayonetta, ZombiU, Shin Megami Tensei and Fire Emblem are not mature.
*fc03.deviantart.net/fs70/f/2012/314/4/6/this_is_hardcore__1_by_weebiart-d5klfn1.jpg
Expert Gran Turismo 5 Drivers to Compete for Go Pro in GT Academy National Event - IGN
Expert Gran Turismo Drivers Can't Race In Real Life Because They're Too Fast
competitive racing anyone?
*oyster.ignimgs.com/wordpress/write.ign.com/134081/2012/11/Mario-Kart-IRL.jpg
mario kart is for kids, accept it.... the sooner the better
*img.gawkerassets.com/img/18e3yadptyz36jpg/k-bigpic.jpg
Mario Kart Cosplay gokarting != Competitive Mario Kart.
Did you even race online/against ghosts on anything above 50cc when you had MK?
If you can't refute my claims just continue ignoring them like you have done for a lot. Don't descend into insults and derision.
GT may play like a real car when using racing wheels and pedals but when using a dualshock 3 it is anything but hardcore. Trained GT drivers were too fast for GT amateurs isn't too surprising either.
Just because something is also suitable for kids doesn't mean that it is not hardcore.