Ban: Possession, Urchin, Governor, Ghost Ship, Minion, Quest, Donate. All either un-fun or swingy to me. Quest is often a waste of a slot, and I don't like that Donate is a must buy. It's just too strong of an affect for me to enjoy in dominion.
Dislike: Tournament, Saunavanto, Chapel, Rebuild, Cultist, Keep, City Gate, Raid. Sauna, Rebuild, Cultist are too monolithic. I got bored of Chapel and I prefer more interesting trashers (I don't really hate it, just didn't want to see it for a while) Tournament is too swingy, Keep is annoying, city gate is great, but it's annoying and makes the game way longer, Raid is just stupid, and a waste of a slot.