Fillipo
Its usually not the muzzlebrakes fault if the accuracy isn't good.If you work up your load with the muzzlebrake installed then remove it this can sometimes give you less than desirable results.
You have to work up your load with the brake installed because adding the extra weight is like adding a tuner to your barrel.
The horror stories you read about are from shooters who have a pet load then install a brake and don't upgrade the load.This is common with suppressors as well.
Lynn