If by "a layperson can easily tell if an image or text is “good”", you mean a layperson can easily tell if the image depicts a physically plausible or photo-realistic scene, or if the text makes sense, then I agree that music is harder in this sense. The closest musical analogy for these quality issues is perhaps telling whether or not the instruments sound realistic, and laypeople don't spend enough time focusing on the sound of real instruments to be really good at this.

But if you're talking about judging artistic merit, then I don't think a layperson is any better at doing this with images and text than they are with music. Artistic judgement is extremely subjective across all fields of artistic expression, and experts in these fields often disagree with each other, or with the general public, about what's good and what isn't. E.g. compare the popularity of Fifty Shades of Grey to its critical reception.

There's a massive commercial demand for music in TV, films, advertising, games, theatre and online video creation too, so I don't think it would be that hard to make a business case for it, if the data was readily available.