Well, the basic parts are not that great. Plus, it has almost nothing of Scheme (nothing more than e.g. Python has of Lisp), that's just an old wives tale. It just has closures and that's it. Scheme is a Lisp, whereas Javascript isn't [1]. Not sure what Brendan had in mind when he was inspired by Scheme, but the end product is nothing like it.

Coercion rules are crazily bad. No integer type is stupid. Prototypal inheritance nobody much cared for (where nobody = very few). An empty array is not falsy. And several other stupid decisions besides.

The only reason it wasn't that bad, is that it wasn't big enough to be bad. It was just a handful of features plus a tiny (and bad) standard library (some math, some string stuff, etc). Everything else people had to build on top (and usually the did it badly).

[1] https://journal.stuffwithstuff.com/2013/07/18/javascript-isn...