Sales are not a direct indication of quality. They never have been for any product. High quality products can sell very poorly, poor quality products can sell very well. For example Starbucks is not good coffee. It sells very well.
I'm not saying GT5 and GT6 were outright bad products but likewise the fact they sold well is not a direct indication they were good products either.
I'm not saying GT5 and GT6 were outright bad products but likewise the fact they sold well is not a direct indication they were good products either.