Client made changes to logo by himself?

So I sent the final version of the logo to my client and he then made changes on it by himself and the logo looks far worse. Do I just let it be or do I bring it up that I don't think it looks good. I just don't want my name attached to logo with his changes.

Great design resource

100 Things Every Designer Needs to Know About People (Voices That Matter) Submitted October 05, 2016 at 05:26AM by ryanino http://ift.tt/2ds5oJG