Welcome to the forum and the Nissan Navara family.
I thought I had a fuel consumption issue with mine, seemed a little thirsty, but being new to diesels I didn't know that I only had to wait and the engine would loosen up, which it started doing after 13,000km. At nearly 25,000km now, my car's returning 11LPHK instead of the expected 12.2LPHK (based on weight). I'm happy with that.
There's a bit of turbo lag, which is annoying sometimes and if you push the revs up in the manual before releasing the clutch, you'll find that clutch is begging for replacement very early on, because the high torque once the turbo cuts in will eat the clutch in no time.
Might be a few more issues, but ya know, as Krafty pointed out, that could be the case with any car. Some are waiting for the VW Amarok (sp?) to see what it's going to be like, but I couldn't put myself back into a Volkswagen after having lived through a disastrous Kombi.
For the money, the Navara has the right capacity, features and feels nice on the road. We've had ours in forests, mountains and in the desert and it's performed flawlessly, even with the 1.8T caravan behind it. If I was making the decision about "which ute" again, I'd go the Navara again without any question.