Hello, welcome to the forum.
Why are Renault so bad? Hahahaha that is like asking why the universe expands and if there is life there ...
today, manufacturers take out their "mills \" to the street so that they last 7 years at most or 200,000 km, the cost of production of large brands, is something as serious as the issue of recycling the cars and their waste.
On the other hand, we have the Asians and those of Eastern Europe doing huge pressure on the market, manufacturing below the market price.
Total, which make half of the plastic pieces, the other half of paper and what remains is a car that has a residual value in the very low market, (a mercedes of € 60,000 is not the same within 10 years, than a renault of € 7,500 within 10 years).
No Renault Eye, General Motors had to buy Daewoo because he was fucking Opel, taking very competitive cars in the sector at a lower price. Now Daewoo is marketed in Europe under the Chevrolet label.
If a factory can save a bulb that is worth € 0.30 to do it, because multiplied by tropecos hundred cars a day for 365 days is a lot of money.
Greetings, I hope you don't fall into depression after reading this !!