Things I dislike about the YJ include the square headlights, leaf spring suspension, and those stupid looking bumperettes on the rear. Things I dislike about the TJ are some of the odd way things are done on it when you get into the dash and other random places that are awfully Chrysler-like in their design. I like all the Jeeps, though. I'm disappointed with a good bit of the design on the JK, including, but not limited to, the decision to make a 2WD model available to the public and not just the USPS. Overall though, it's a good vehicle, too.
I will never get used to the JKU, though. I've actually mistaken one for an H2 before.