I’ve found this interesting article about unsuccessful rebranding from graphicdesing.com. It’s good to learn from mistakes and use to improve your work. This article also have polls for you to vote about unsuccessful logo
you can check out this article by clicking an image here,
Example from one of poll questions.
So, if you are in a branding field I would recommend you to check out this article and maybe share your ideas.
Which brand did you vote for the worse rebranding?