The worst thing about CSS is that a lot of people don't bother learning it, then have a strong opinion after they were forced to use it for a day.
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How dare people use CSS without learning in-depth all 20+ specifications! It's an outrage!
When people have problems using a tool, you should look at the tool rather than blaming the people. People aren't going to change. You don't tell people to be more careful using a bandsaw; you install safety features.
I'm a big believer in learning new stuff, when that stuff has lasting value. However it is far more efficient to fix things, a one time cost that benefits everyone, than to ask everyone to learn the quirks of a tool, a cost that is paid every time someone new comes along.
JS is in general better because by the time it came out people knew what to expect from a scripting language.
CSS didn't really have a lot of earlier styling and layout languages to copy. Also the original vision was much more limited.