I thought it'd be interesting to share this here! This post is from a community event in Reddit Pixel Dungeon that often gathers hundreds of votes, and the event is finally completed just a few days ago. The highest votes on what people think is weak (or boring/lame) is featured in this image, and it's a good way to measure what the community thinks overall.
I'd love to post the huge amount of comments and discussions to Lemmy, but it might be better to just visit the Reddit posts. There's some deep and interesting discussions from the community on why these things suck. The second-worst items that gained significant votes may also be worth looking into: chaotic censer, unstable spell, death mark, magic missile, transfusion, unstable enchant, etc
Regarding Chaotic Censer, I personally think recent updates have made it usable at least. It sucks when it destroys loot and wrecks players in cramped spaces, but the fact that it now shows the gas + direction before it activates, it's a good improvement. At least players won't be at the mercy of RNG deaths and we can adapt to the situation with the tools in our bag.
Maybe it's just me but I personally think Censer is B-minus tier now, Cleric Cleanse can use Censer! Mnemonic Prayer still sucks though, dumping on Lance and Hallowed is way better. I'd personally vote for Vial, Mimic, Sundial, Parchment, Trap as the worst, the rewards are never worth the pain. Can't decide which is worst, but Vial has extremely niche uses. It's unnecessary on 0-chal and it's useless on high-chal since there's no dew, potion, etc. Salt Cube is better for diet. You somehow need to find good viscosity armor early in the sewers to actually pick Vial.
I'm more interested in the worst-craft section, cooking meat is obvious first place but I think the runner-ups are more important to tweak like unstable spell/brew, summon elemental, alchemize.