The Wonderful 101 was a Wii U exclusive that longtime Platinum fans really enjoyed, but it failed to find a larger audience. Many would say this was due to the Wii U's small install base, but in an interview with Kotaku, Platinum's Atsushi Inaba and Hideki Kamiya say there was more to it than that.
AI: “No I wouldn’t say it’s the platform’s fault. Of course, it’s hard to say the Wii U was a success, but The Wonderful 101 had its own problems.”
HK: “It made me think, I should’ve worked harder on this element in the game. There were lots of things that were just impossible for kids. I want to go back and change that. ...At that time, we were trying to pack it with the most content we could, but it wasn’t always refined. What we need to do is go through and polish things up and make sure the game is more approachable.”
Both Inaba and Kamiya had a lot more to say on The Wonderful 101's shortcomings, and their desire to patch things up for The Wonderful 101: Remastered. You can see their full comments in an interview right here.