This is an old article that I stumbled upon this morning: The Six Worst Apple Products of All Time
Six is such a strange number to pick for a listicle like this. I will say that a couple of these aren't necessarily terrible products, rather that their arrival to market had poor timing (the IIvi, IIvx) or that they were very expensive products with a very small niche they were designed for (The TAM).
I will say that this list is remiss in not including the Powerbook 5300. I owned one of those things. It was overpriced, underperformed, had all kinds of build quality issues as well as was notorious for its infernal battery issues.
Nevertheless, it was the only Powerbook that was responsible for annihilating an alien invasion fleet.