Here I go so far I’ve watched a lot of anime, and Attack On Titan is so popular, I also saw it. I even want to buy some cosplay outfits to cosplay Eren Jaeger, she is so cool! The anime is very detailed and high quality, and there's a lot of attention to little things. I like this anime. This character's reactions to what's happening in the world around them are realistic. This anime is so popular because of the amazing ost's or the giant humanoid Titans!? Or others?