I don't think there's anything wrong with people writing down their own thoughts about great works of literature like the Iliad. What I really do appreciate are

I don't think there's anything wrong with people writing down their own thoughts about great works of literature like the Iliad. What I really do appreciate are the people who review such writings-down so that I can make an informed decision about whether their thoughts are worth my time to read. In this case, I imagine that any book analyzing the Iliad is intended for readers who have already themselves read the Iliad at least once.