Their relative lack of ambition on the WiiU. They've released some genuinely fantastic games, and plenty that make great general use of the WiiU's hardware, but it took them 3~ years to make a game i felt properly justified the relative jump between the Wii and WiiU in ambition (that game being XCX). I understand they had a lot of issues transitioning into HD development, and there's still BotW on the horizon, but it's hard for me not to be disappointed at having to wait so long for so few examples of what i originally expected to see frequently.
I should note that this complaint isn't reserved for just Nintendo, i feel like the 8th gen in general has been slow on the ambition front (relative to what we know each system is capable of), but Nintendo don't have the luxury of brute forcing ambition through major 3rd party support, and in general i expect more from them than i do most publishers.
