Personally I found that’s what made it so real and freighting knowing it’s all just an act he chooses to portray to the general masses instead this is who he truly is a regular troubled individual who found a group of like minded people. Extremely scary.
The Riddler in this film was the type of Villain that exists solely to be the Antithesis of Batman/Bruce Wayne. Although to be fair the Riddler has never been a scary villain so this is probably the most function he's ever had in a Batman story. Really when you think about it the Riddler is worthless on his own. His Only Power is literally Autism...