The only thing people were complaining about was bugs glitches and bad optimisation.
Jump on it while you can! Release a patch and fix that stuff! you should get some positive reviews.
And ignore those pirates, they will strangely act as marketing for you.
More people playing the game means more people know about it. So just try and go with the flow and embrace it somehow. And use it to your advantage. (You can’t get rid of them.)