Do not understand the whole 5-star rating

I have tested the last few years various air purifier of Comedes, IQ Air, Venta, Sharp etc. This one I had also a few months. Bad he is definitely not great functional, 3 large filter surfaces and a UV light. But that alone does not give 5 stars because in important ways he slips up properly!

A star deduction he gets for a missing pre-filter.
The first filter in the system is the Hepa so that all dust, hair, etc. immediately absorbed by this. A simple pre-filter for washing or vacuuming would significantly improve the durability and hygiene.

Moreover, is not very convincing, the design of the activated carbon filter, it consists of individual cells that are about 3/4 filled with activated carbon. Why should the air flow going through the activated carbon, even though he can simply flow past the upper 1/4?

I would definitely buy it for 160 euros a second time!

EDIT: I have the rating increased from 3 to 4 stars, as new replacement filters are well delivered by Komerci with an insulating foam. Thus the point of the bad filter isolation is obsolete. Replacing the filter is actually very low in contrast to the competition.