At first, it was good with all the detailed lore and stuff with the main story. Then, the MC chooses to gamble, risking getting the infamous Voldemort of the DADA curse rather than facing his sealed memories just because he wants to speed up the investigation. To make things worse, the author and the MC knew the power of knowing the main plot, yet they decided not to accept it. His character becomes pretty timid and stupid after coming to Hogwarts, which makes his previous brilliant impression as a 'golden viper' gone. I don't know if the author stopped in the middle of writing and forgot his initial plot or something else, but the MC is pretty inconsistent. It would be pretty believable if he were somehow controlled by the old Dumbledore rather than making all these stupid decisions.