I was impressed even with Nintendoland, which was the first game I played on the wii u. It may not look as good as a ps4 game, but I don't care honestly. Compared to wii games, wii u games look stunning. Could they look better? Of course they could. Would I prefer a Xenoblade X with the new star wars game graphics? Fuck yeah. But for me it's incredible how good it looks compared to Xenoblade wii, which looks simply terrible (though the game is still a fucking masterpiece).
I have the ps3 and nothing has made me want to buy a ps4 yet, but comparing wii/ wii u the bump in quality is really noticeable so I bought it almost day one, just compare mario kart wii and wii u, just wow!