Okey dokey, here's my (thankfully) short list:
Dior Glow Maximizer primer- utter shite. Made me look like I belonged on top of the Christmas tree with a branch shoved up my foo-foo.
Ester Lauder Pure Colour Envy lipstick in Intense Nude - love these lipsticks, but the colour wasn't great on me.
Not sure if Sali recommended this or if it was another "influencer", Nanoblur Instant Skin Perfector - made my foundation "pill", took it back for a refund.
There must be more, but the Dior product really sticks in my memory as being one of the worst makeup ptoducts I've ever bought.
With regards to CT, her products are (in my personal experience) extremely variable. I love her powder eyeliner pencils, her pressed powder and her lipsticks. I
dislike her foundations, her powder eyeshadows and her stupid bloody "Magic" concealer, the worst concealer I have ever used.
I've always found Bobbi Brown good for nude or MLBB shades.