I'm very particular about certain cards. Whenever I get a new deck I judge it primarily by 3 cards: The Fool, The Devil, and The Star. The imagery really has to speak to me or they throw me off when they come up in a reading. For example, The Fool of The Golden Tarot (by Kat Black) is the most BLAND expression of the card I have ever seen, so I use this deck mostly for spell casting as opposed to divination.
The one card I never seem to understand in a reading is The Star, and it drives me nuts lol. I have a hard time figuring out what to make of it whatever position it shows up in. In terms of it having a personality, it's like someone taunting me with "I know something you don't know..."