As many people there is in the world that much opinions and tastes you will have.
I will not speak of others tastes and preferencies, but I will give mine.
In some cases OEM head unit provides touch of class for enthusiasts having exactly the same what car would have when leaving the factory.
In other cases OEM head unit provides peace of mind knowing this head unit will last long knowing that is realy good head unit which will last longer than many todays modern one.
If anybody wants special sound with subwoofer sound or similar OEM head unit will mean nothing to them as they probavly will replace it as soon as it comes from factory with their best head unit with amplifier and subwoofer in the boot or similar.
Each to their own.
From my point of view this particular head unit from above is Blaupunkt and as such it is much better build than many todays head unit. Sound is excellent and if anyone wants to enhance the reproduction with amplifier and additional speakers it can. It can also be added with mp3 player. iPhone or any other smartphone, USB stick or SD card with any music you want.
This is more than enough for me.
I am also driving MGRover cars because of thier build quality, performance, ease of maintenance and reliability. In the meantime I become ethusiast regarding these cars, but that does not change my initial thinking of these cars.
Todays electronics and cars are built to last exactly defined amount of time in order to support consumer disposal habits and buying new models.
I know that might be important for economy but I do not like it and I am much more satisfied with good "old" fashion lasting electronics and cars because I do not see or hear much advantage in any new car or electronic for my taste.
When electronic brings some features I need and they were not available before I will buy it. Unitl them I am more than satisfied with existing ones.