While browsing Reddit, I saw these examples of atrocious box & label designs. Interestingly, from reading the comments it appears that both products are actually really effective. So, this is an example of why you can't judge something based solely on appearances.
That post was about this Superthrive plant food. The slapped-together layout and bold graphic style scream 'cheap garden center product', but people claim it really works:
In the comments of that post, I also saw this image someone shared, for Dr. Bonner's Magic Hemp & Peppermint Soap. This is an unbelievably dense rambling mess, but would actually be a great thing to have in the bathroom for a random crazy read:
(click to enlarge)