Mine does not have that much dammage from going on the highway, but I only do about 20 km per day on the highway.
Do you have a lot of construction around? there is no car that will resist rock impacts, no matter if it is a luxury car or a 15,000$ one. If you have such dirty roads in your area, maybe you should have some protector film installed. I only have one little rock chip on my hood, and maybe 2 on the front. I now try to avoid the highway as much as possible because there is construction and the highway is dirty and full of lose rocks.
The Micra has a very flat nose which is making rock impacts more likely. This is not a problem for those who do more city driving.
My boyfriend has a Honda Civic 2012 and he does a lot of highway so the front of his car is full of paint chips.
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View my fuel log 2015 Micra SR automatic: 7.0 L/100 km ... 40.4 mpg (Imp) ... 14.3 km/L ... 33.6 mpg (US) ...