Agreed. I didn't say features; I said looked. It looks horrible in comparison.
ES6/7 code is much cleaner, clearer, and more idiomatic, than CoffeeScript. (in my experience, and I've used/debugged/worked with a LOT of both)
Not going to crap all over the features of CoffeeScript, those were good (though they produced pretty awful looking JS code as a result). I would say however it wasn't worth the trade off in debugging pain.