This thread is further prove of Betteridge's law of headlines
I remember Dan Brooks saying that Events should be automatically ranked 10 spots higher than where you would put them [in the card rankings] just because they're events. And I'm pretty sure he's onto something there.
If you want to decide whether you want a card it's basically calculating whether its upside of playing/having the card outweighs the opportunity cost of gaining the card aswell as, most importantly,
the opportunity cost of having the card in your deck. Funnily, Scout is the best example of that. There is almost no downside to playing Scout, and sometimes you could have easily gained them. Why didn't we? Cause it took up space in our deck which wasn't worth the upside. If you were gifted a princed scout, you would be winning the vast majority of your games since all the downsides of scout would be gone.
Of course, this is also true for events. They have no similar opportunity cost, so we only have to measure the upside of buying that event. Additionally, you can decide how often you use it and be done with it. If you gain your Golds via cards, you stuck with a dead one if you don't want more Golds or go out of your way to get rid of the gainer.
It doesn't surprise me that the treasure gainers are still the worst events, since most others are just insanely good. Yes, in most games you don't want those, but they don't hurt when they're available (Scout makes 9 card kingdoms, Quest doesn't, aka opportunity cost of being in the kingdom). So Events are either strong or meaningless and never bad like Kingdom card are.
Quest is most likely the weakest one, the six card option is just so strange (it means you have draw in the kingdom and your average card is worse than copper), the others are still ok in sloggy games or as a cheap gold gainer for engines.
Banquet will be close but atleast it has some decent synergies.
edit: Annex is fine is thick decks, where does all the hate come from? Removing five cards produces a lot more money!
We still have plenty of useless cards to choose from if we need a new scout meme, just look at Harvest, Stash, Duchess, Cache etc, those have real negative impact.