Nothing.
Unless left OEM, every Jeep becomes a reflection of the owners personality by the accessories added. My Jeep has been totally reliable and fun to drive.
The 'Original SUV' still sets the standard by all others follow.
Needs more rear storage space and a dash redesign.
Others have said the TJ is light; I find it rather heavy for it's size which is reassuring in the age of plastic.
Needs more power even in a I-6.
Viper V-10 is only 6 inches longer than the 6 cylinder. Just have to mount the rad on the front side of the rad support. Should solve the "lack of power" problem.