However, the LDS collection includes many millions of indexed records obtained directly from states, counties, government agencies and church registers. Usually the scanned source document is accessible. These are reliable, and very inconvenient to get from the original issuer otherwise.
The inaccuracies occur when John Doe submits a family tree he created based on the memory of his 90-year old great-aunt.
Most of the cases where incorrect information has been entered for my ancestors come for from none LDS.