All of the unnecessary deaths and then Harry only almost dies a thousand times
The “Harry Potter” series is basically just about how a broody pre-teen/teenager breaks every rule he’s presented with because he thinks he’s special and then puts the lives of everyone around him in danger, because he’s an idiot. To top it off, death is a permanent thing for everyone but Harry. The fact that he got to fulfill his death destiny and then come back was a total cop-out.