Nothing.
When I bought this truck I had no expectation that the ride would be smooth, that the acceleration would pin you in the seat or that it would hug the road around corners, it's not supposed to it's a truck.
The fuel economy is bad.
The thing I like the most about this truck is that it's a truck. There are no unnecessary bells and whistles that can break or cause problems. The seats are comfortable enough, the heater works well, the stereo sounds just fine. It has no problem driving up the rocky bumpy, sometimes snowy icy road to my favorite trail head. It has enough power to pull a 3000# trailer with no problem, and it can handle a 1000# plus payload just fine.
My dog loves to ride in this truck, and if it works for him it works for me.
In the almost (2) years that I've owned this truck, nothing has gone wrong. This is way more than I can say for any other vehicle I've owned. Even after bouncing over rocks and logs, this truck is still rattle free.
I agree with everything mentioned. Definitely disapointed with the mpg. I drive it very gingerly and can't muster anything better than 17 mpg.
As stated in other areas of this website, your mileage will improve as the motor breaks in. Especially if you drive a Toyota motor easily for 15,000 miles, it hasn't really begun to break in yet. I own a '98 Tacoma, v-6 standard, bought last year with 29,000 miles on it, owned by an old man who got tired of driving a stick, and I now have almost 60,000 miles on it, and my mileage continues to improve. Buy and install a K&N air filter; they are worth their weight in gold. I swear you will notice a slight increase in power, and your mileage will definitely improve.