Around here they are deemed as reliable as the sunset. This leads to comical situations where 10-15 year old VAG autos are sometimes priced almost the same as 5-10 year old autos from other brands.
AFAIK only real sour lemon were the 1.4 petrol engines and those dual charged engines from the mid 00's. But around here everybody knows that only true VAG engine is a diesel. That is the folk lore around here not my own opinion.
I myself drive a Peugeot as for my tastes price/performance of VAG is not as good.
Personally I would steer away from Renault (had several, only "good" car was R4 :)), and basically any American brand. I think that in the value department Asian brands are giving European and US brands quite a run for ther money. Too bad they do not make a Berlingo/Caddy/Kangoo class of a car.
Even if VAG is total shit, dual charged engines are not something you would want in your vehicle. I think hybrids are a much better and simpler option.