"My own experience with JS is that it's not a very well designed language. You only like it because it gives you functionality you want, not because it is inherently a good thing on it's own. If somehow Perl or Brainfuck were the client side language-of-choice, you wouldn't care one whit for JS."
Yes, that's true.
I would add just one important detail. The precise reason why I love JS is not just because it gives me the functionality but it gives me the functionality ON ALL DEVICES. It's not enough to have another language that is better or gives more functionality than JS.