Other than Chancellor at the bottom, this list bears at best a passing resemblance to mine, but ranking the worst cards is always tough. The sample size of games where they dominate is often small enough that you can't really get a good comparative opinion. A lot of it comes down to playstyle.
I personally have all the gainers (Workshop, Smugglers, Develop) 5-6 spots higher than they show up here, but that's probably because I tend to really enjoy low-trashing engines predicated on gaining a bunch of key cards to achieve the needed good card density. Shanty Town I like for similar reasons. If you trash heavily, it's worse than a regular Village, but if you don't have much trashing, then the +2 cards comes into play more and really helps you in the build-up phase.
Fortune Teller I have much higher, but it's hard to rate since it doesn't actually end up getting purchased that often. It's more of a card good for engines battling money decks. If you play with people who tend to play the same style as you, you may never buy it.
Loan tends to always be underrated, and I'm not sure why. It's trashing that doesn't cost an action...
And since I have all these cards rated much higher, something has to fall, so in my list, Wishing Well is bottom 5. It has its applications, like when you know what's on top of your deck, a lot of times it's unreliable at best. You need to have a bunch of the same card in your deck (like your starting Coppers, or a bunch of Wishing Wells) to even get a 30-40% conversion rate on the wish. This just doesn't seem like a great thing to build a strategy around to me. I'd rather take the gainers.
Black Market is also getting a lot of discussion for not having shown up yet, and I think it's a very interesting card in terms of how people feel about it. It depends heavily on the cycling power of your deck, since you have to play it a lot to find the good cards, then cycle around to play those cards enough to matter. So if you're going to play a game where you shuffle 4-5 times, it's terrible. But if you shuffle a lot, you can't really ignore it, since then you're just asking for your opponent to get ALL the good cards. Things that depend on number of shuffles have an interesting dynamic of who likes them. Beginning players don't know how to end the game fast enough, so they always shuffle a lot, and strong engine-builders can make a fast cycling deck on practically any board. Players with less engine-building experience, and players who focus on money-heavy rush styles tend to think it's terrible.