"I wouldn't say that I've ever made a bad game, per se, but a game I think we could have done more with was Zelda II: The Adventure of Link."
"When we're designing games, we have our plan for what we're going to design but in our process it evolves and grows from there," Miyamoto said. "In Zelda II: The Adventure of Link, unfortunately all we ended up creating was what we had originally planned on paper."
"I think specifically in the case of Zelda II we had a challenge just in terms of what the hardware was capable of doing,"
Sourec: http://kotaku.com/shigeru-miyamotos-bad-game-514017583
What's your thoughts on this? Spirit of Rutela made a really cool thread that may have sparked this, and it also goes to show their mentality with modern Zelda: most games are really just testing grounds for what can come to pass. TWW was a testing ground for TP; TPWii was a test for SS; OoT3D was a test for ZeldaBLT; WWHD is a test for Zelda U.