Does ES6 eliminate all of the bad parts of JavaScript?

There were bad design decisions made with JavaScript (for example; the handling of this ); we have had “JavaScript: The Good Parts”, for a reason.

But ES6 improves upon the above said bad parts; introducing keywords like let, const; and better handling of this through fat arrow functions.

My question is this — With ES6, would you still say that there are any bad parts left… (I am not talking about the lack of features) in JavaScript; ones that are still to be addressed?

Some would argue that class is the new bad part, with ES6; but that is debatable.

Curious to know the opinions of the JavaScript pros in here?