I'm sure not every car that is currently being sold in the EU market, got a 5 star rating. I'm even more sure that not every car in the 2nd hand car business, got a 5 star rating. Given the low price and low volume Brilliance is shooting for, there will be takers.
In business, there are certain decisions you gotta make. I'm sure, had Brilliance had the choice, they'd invest billions of dollars and take 5 years more time, to come up with a true world class car, before they enter the EU market. But no one has that kind of money and time (and confidence). So they're entering the EU market first with an okay car; not great, just okay. To test the market, make improvements, make a little bit of money (at least help finance the debts), then get better and better on the next waves of cars. It's a very sound strategy to me - for you can't learn very much until you jump in and get the feet wet, yes?
By the time Brilliance get to the US market, they'd be ready. Without this EU experience, they never will.