To the writers here on Fluther, could you tell me how reviews and ratings of your books are vital?

Considering the ratings, well, there’s the average rating listed on Amazon, on Goodreads, etc. But, the reviews, well, it’s obviously more complicated. Especially for a famous book, when it gathers even thousands of reviews. A writer doesn’t have the time to read all of them, how can (s)he? And, it doesn’t end there. The reviews could be written in poor form, they could be written in a foreign language, or, more simply, you don’t agree with them, so you don’t read the rest. I simply would not be able to read them all and remember them all. Would you?