I don't really see what is so bad about this really. The majority of remarks that do get changed usually only go up or down by a few marks which are in subjective essays so both of examiners would essentially be 'correct'. If the examiner accidentally skimmed over a certain comment in an essay then that would qualify a marking error and they would be changed. And on papers where there is a specific mark scheme then there will be only right or wrong answers and if a right answer got marked wrong then that too will be changed.
Too many people rely on the "I must have had a bad examiner" excuse if they do badly in an exam or if they don't get the grades they want. Whilst it is true that an examiner who is marking paper after paper may make the occasional error, it is seldom going to be a really large error and really won't have impacted the grade as much as your performance did. And if the examiner did make a large error, then this remark system will let that be rectified. The changes also require exam boards to release the scripts to the colleges so the teachers can see them and work out whether a remark is needed.
In no way is this new system making the remarking process very unfair, it just will make us learn to trust that the examiners know how to do their job and if we didn't get the grades we need then 9/10 times it was because of our own performance. If anything, the old remark system was grossly unfair as it was abused to a ridiculous extent by private schools and colleges who had the funds to pay for remarks for all their students so they could all go up a few marks. State schools don't have nearly enough money and, if they did, their students would probably have the same benefits. So this system puts schools on a more level playing field too.
Really my opinion is to stop whinging about remarks and how bad examiners are, and use that time to revise and perfect your exam technique.