Our first good camper had an electric tap and a kitchen sink etc, I found I wasn't the "need a kitchen sink" type of person, we don't fancy electric taps either, they seem more problematic and waste more water tool.
The second camper had a basic tailgate kitchen, I didn't think much of it, we ended up taking it off, modifying it so there was just a fold down storage shelf on the tailgate instead. Granted the design probably wasn't the best, I didn't find that it was an efficient storage area, well not for the stuff I carry. And stuff had to be packed up if you wanted to shut the tailgate while going for a walk or whatever. And like others have mentioned you've got your back to everyone, but it's not that, you're stuck in one spot can't always allow for wind direction etc
So for me a table with the stove / dish bucket was a better solution, probably even easier now that we've gone to using a dual fuel stove.
Depends what the cooks preferences are really,
That Drifta car back sure looks nifty, I'd definitely consider one of the more compact drifta models if our next camper or current trailer/car set up. Seems like it would just replace one of the boxes that I normally store my kitchen gear in anyway!