The advent of the LCC has probably made no difference to the percentages of the good, the bad and the ugly
Nowadays a good percentage of pilots joining airlines have to pay for their type rating. Could be anything up to $37000 and that is a huge loan from the bank that has to be repaid. This is now a common policy both in Europe and USA.
There are agents to whom you pay big dollars to get you a temporary first officer job in an airline where the airline has an Agreement with an agency to accept brand new type rated pilots who have got only the minimum of paper qualifications. Thus you see first officers flying aircraft like the 737 or Airbus with under 500 hours total time. By any standards this is very low experience. Most of the time it works out OK although the workload on the captain caught with these low hour pilots can be strenuous.
There may be a tendency for check pilots to accept a lower standard of piloting skill with these "trainee" airline first officers because of real sympathy for the financial sacrifices these young pilots have made to get their dream job. A sort of "there but for the grace of God, go I" feeling.
The check pilots are happy to insist on high standards from the more experienced pilots they fly with. But there is little doubt the same check pilots are tempted to go easy on the fresh face new CPL with a bare type rating and 250 hours plus. It may also be a commercial consideration with cost savings from employing low hour pilots who may be on a miserable pittance while they rack up their six months or 300 hours before the Agreement runs out and they are told bye bye.
The cut-off line between scrubbing the new pilot during type rating training or even line training and thus busting someone's career - or closing one's eyes to the marginal pilots with low experience, is sometimes blurred - with kindly check pilots allowing a sympathetic nature to sometimes overrule a wise decision in the long run. Yes...it is possible some check pilots occasionally might accept lower standards than they would otherwise like.