in terms of content, it is only bad when you need to study for trials as you are limited on time. generally, the information is quite easy to understand as pretty much everything overlaps. it isn't too hard, just need to understand how to evaluate and answer questions which you can do quite easily. its also one of those subjects where a teacher is like not needed because you can just study off textbook.
another plus would be the essay questions have pretty much all been asked before, so theres a very small chance that theyll ask something you wont know how to answer (if youve studied) - oh besides 2019 hsc what the fuck