The current generation of home console hardware has had an interesting challenge in defining itself as 'next gen'. In the era of Wii, PS3 and Xbox 360 Nintendo brought motion controls to the mainstream while its contemporaries placed their focus on HD graphics and a drastic progression in online multiplayer gaming. In this current generation it's been tougher to differentiate hardware beyond raw power. In terms of controls Sony and Microsoft have remained rather constant, while Nintendo made some attempts to promote dual screen gaming and usage of the GamePad, but has ultimately only done so to a fairly limited degree.
When it comes to graphical power, the margins have been less obvious than in the last generation for Sony and Microsoft; objectively the latest current-gen games are a notable step up visually, and open world games are increasingly sizeable and dynamic, but the jump is arguably less dramatic. The same issue has perhaps afflicted the Wii U, to an extent - though there have been undoubted highlights with the big N's franchises being in HD for the first time, those with other systems will perhaps gaze upon the Wii U's visuals with less wonder. Naturally there are a number of beautiful and wonderfully realised gaming experiences across all systems, with some examples where gameplay has tested new ground, but it's perhaps been a smaller generational step forward.