In order to conclude that a hypothetical Earth/Heaven/Hell system was broken and that suffering which occurred on said hypothetical Earth was 100% definitely wrong and unfair, we'd first have to conclude the following:
1) We now fully know ourselves and all our prior, current, and future actions, therefore we are qualified to authoritatively judge whether or not things which happen to us now are unmerited;
2) We now fully understand the nature of reality and our part in or of it, therefore the occurrence of evil is a standing injustice and an existential problem;
3) Our biologically-limited linear perception of time, and our traditional philosophical assumptions thereof about cause and effect, are accurate as to all forms of existence;
4) It would be unfair and wrong for us to have to take a lot of time to learn about an incredibly vast and complex system on our own, and we would be better served learning about such a system by having it summarized briefly to us, rather than by participating in it in an intimate and thorough fashion.