Semi-offtopic, but you've clearly spent a lot of time studying Nintendo's code, from a range of eras... I'd be curious to hear, if you had to make a very broad assessment, how would you rate the quality of Nintendo's programming?

Nintendo is quite clearly second-to-none on the design/creative end, how much does that translate to the technical aspect of game development? Speaking purely in terms of software.

I find this particularly interesting in the context of a company that appears to retain many of the same programmers today as they did 30 years ago, when software development was obviously much different.