Occasionally I get stuff to review, but I also buy stuff to review. Fact is, however, most of the stuff I get either sent or I buy I don’t review.
I try not to publicly criticize. Plus, I don’t think it is a good idea to publicize things that are bad.
Praise in public, criticize in private.
When I get sent things that don’t work in some way I will let the manufacturer or retailer know. They don’t always appreciate that even.