Hello Amel,i believe that the key of success of any company in embedded world right now is to be close to its customers , I whish that this forum be improved so ST products can be more popular and more used, STM32 has succeeded to be one of best MCU ...
it depends from the company that you will report your bug to, for example : Texas instruments has a very organized forum in which you find experts from the company to fix issues reported by people but unfortunately not the case concerning ST.