I disagree. All else being equal, readability is the most important criteria. And readability is the greatest contributor to maintainability. Next to that, being "well-organized" is what makes something maintainable.

If your code is correct but unreadable or disorganized, it will be hard to extend.

If your code is incorrect, but organized and readable, it will be easy to fix.

If your code is incorrect and organized, but unreadable, it will be hard to fix and extend, but easy to make it more readable, thus more extensible and fixable.

If your code is incorrect and disorganized but readable, it will be hard to fix and extend, but easy to refactor, thus more extensible and fixable.

And code is always incorrect.