I will throw my thoughts into this:
I have a 2009 Touring, with the AT, bought with 6 kms in September 2008. Currently has just over 55,000 kms.
I have had no warranty work to date.
Fuel economy has averaged around 9.3 l/100kms, for mostly highway driving. Have seen a few tanks under 8 but not many.
The AT seems well suited to the motors characteristics but I agree that another gear would be nice, allowing the ratios to be mixed up a bit better. It has a few neat features like being able to lock the front/rear torque distribution to 50/50; as well as 3 different shift modes (normal/economy, sport and manual).
As far as pep goes, I have no issues with what it does for me. Just got to be willing to use the the upper part of the rpm range. And this is helped by the easy to use manual shift mode of the AT. Also helps to understand that the AT does not respond well to "flooring" it but gives much better response by tipping into the throttle a bit before hammering it. A weird quirk for sure and takes a bit of getting used to.
I also do not have any issues with interior room. It seems better than the 2002 Nissan Pathfinder it replaced, especially the rear seat area and rear cargo area.
Stereo is a matter of choice; again I have no desire to replace mine but then I am not an audiophile by any stretch.
I found Mr. Chase's comments on the suspension interesting. I again have no issues. i do not find it floaty, nor is the body roll an issue for me. I have pushed it and it really likes to be pushed.
It is wicked fast on gravel roads. You need to keep attention or you will find yourself going much faster than you intended. Very "stuck" and stable in the looser stuff.
It is actually very decent off-road, with generous ground clearance (just under 9") and underbody stuff like exhaust items tucked up well away from potential harm.
I noticed as far as the seat comments, no mention of too low a passenger seat, this was an issue in the 09's. Did this get fixed I wonder?
Overall I am very happy with my choice and would buy again.