Something that I like about this anime is its art style. Before I watched Doulou Dalu, I only liked the regular 2D art style that most anime used. However, it seems to work for this type of genre. It makes the fight scenes cooler than they would've been in 2D.
One of the only issues I have is that none of the characters really develop except for the MC; everyone has the same personality.
Overall, it's a great anime. The MC retained his knowledge from his past life and uses it to his advantage. It's very satisfying seeing him becoming stronger and unlocking new abilities. For those that enjoy the anime, it's very difficult to stop watching.