React definitely didn't make frontend _great_ in a lot of cases, but jQuery, mootools, prototype, knockout, ember, angular, and a whole lot more JS frameworks that have come and gone predate React. If React hadn't been invented there'd be just as many poorly developed browser apps as there are today. You can't really pin that on React.
What I can pin on react is that it is very inefficient with resources using much more cpu power than needed to render some text and images on a webpage. Imagine all the electricity that was wasted because of react and the negative impact on the environment it has had because of that.