Mueller’s comportment suggests a man who’s fallen prey to the same state of mind that warped Ken Starr—namely disgust over the people you’re investigating and a desire to justify the sunk capital. Even if the special counsel presents one hell of a report, Democrats must ask: was it worth it?

https://www.vanityfair.com/news/2018/12/a-trump-haters-guide-to-mueller-skepticism

It doesn't matter what is or isn't found... Democrats want to know the TRUTH.

So yes, it was worth it, no matter the outcome.