While at my wedding I'm going to tell people I don't like my engagement ring.
It's your engagement ring, why would you tell people you don't like it?
The ring is a dime a dozen, and I want people to know.
You shouldn't tell people that you don't like your engagement ring because it would probably hurt your fiance's feelings. People don't like when gifts they give are criticized, especially when it's something as big as an engagement ring.
This is something I want to do and my fiance is terrible, as are my friends.
The real issue here is that you think your fiance is terrible and if that's true then you shouldn't be getting married in the first place. I think the problem isn't the ring, but rather the person who gave it to you. I would highly suggest calling off the wedding and reevaluating your relationship.