Hate to drag up a discussion thats already ceased, but I missed it the first time around.
I do agree, that if I were going to pick a vehicle for "fourwheeler of the year" then the GX470 wouldn't be my choice. If I were picking "SUV of the year" then it would be a very different story. I have not driven the GX yet, but I did take and extended look at one at the car show, and I did extensively drive the Lexus LX470 a couple of years ago before I bought my Sequoia, but I couldn't justify the price because it wasn't going to be a daily driver.
The LX is every bit as competent an offroad vehicle as the Toyota Land Cruiser it is based on. Lexus does a good job at adding refinement and luxury, but not changing the basic systems and construction that allow the Land Cruiser to be as good as it is offroad. You can take an LX470 anywhere you can take a Land Cruiser.
From what I can see the same is true of the GX. It has the same frame construction and 4WD system as the 4Runner, as well as a height adjustible suspension hill descent control.
Lexus does a good job at making no outrageous claims about their vehicles, they are what they basically are and that works for the buying public, and both the GX and LX are competent.
As for the QX4, its actually gotten great reviews for its offroad prowess. My quess would be it would easily run circles around a stock Explorer offroad...