I very much doubt that's the whole story, or that any of the German brands would have a cheaper hourly labour rate than Nissan.
Tbh (and this isn't directed in particular at the guy I've quoted) I can't help but wonder if people are complaining in the wrong way. Everyone makes mistakes, even car manufacturers, and of course it's how they deal with those mistakes afterwards that's important. Some cars are just naturally Friday-afternoon-assembled-by-the-work-experience-boy specials, that's life sadly, and some brands suffer more than others (just ask the Lotus and TVR owners!). I've had cause to complain on occasion with both the Zed and a couple of previous cars (strangely enough not the VXR220 though) and every time I put forth my case in a straight forward and polite manner, never raising my voice nor using naughty language either in person or in writing. Every time I've had to do this I've been treated with respect and courtesy, and all issues were solved to my satisfaction.
Maybe I've been exceedingly lucky and got dealerships who really wanted to help, or maybe it's because I've been polite about things I've managed to get my issues resolved. I'm not saying that anyone in this thread hasn't been the same way, I'm just merely making an observation.