On checking the checkers: A British airline once conducted an experiment. Some of the best minds in the organization put together a LOFT scenario, then covertly got some of the best stick and rudder people to practice it to perfection in the simulator.
Then they handed the exercise to those checkies who had a bit of a reputation for being screamers or overly anal to run on the guys who were already skilled at it.
The de-briefs were recorded, and of course there were criticisms levelled at the 'candidates'. The outcome was to put a flea in the ear of the check pilots and sell the idea to them to stop nit-picking just for the sake of filling in de-brief time, and to stop trying to flog their particular hobby-horses. As far as the airline was concerned the check division's (note it is a division within the wider organization and not some ego-tripping individual) job was to assess whether a safe and compliant standard had been reached and whether company SOP and policy was met.
The TRAINING department's job is to bring pilots to the above-described standard. If the check department has 'stuff' it wants tidied up, the two organizations need to consult.
If line pilots can't meet reasonable standards after proper initial training and on-going recurrency, either the training itself is deficient or ridiculously demanding, or HR needs to be overhauled (keel-haul 'em, I say) because they are employing half-wits.
Flying ain't that hard. Plenty of people do it.