I started watching this because I thought it'll be like another Love Between Fairy and Devil. But I was proved quite wrong.
Pros-
Bai Lu. She was a dream to watch. She was able to express the different nuances to her role so beautifully. And I was so glad that her character wasn't those over-the-top cutesy, loud and whiny female characters who are busier acting the kawai damsel in distress than actually doing something about her situation. This was one character who took charge at every incarnation she had, and I loved it.
Tantai Jin. His character arc was beautiful to watch. From being an evil Devil God to transforming into a "nicer" person to being a considerate Devil God, his narrative was very well executed.
Acting and Cast. Ye Bin Chang was this brilliantly flawed character, and the actress did a really good job at playing this delicate "flower of evil" kinda role. The other actors were also pretty good in their roles.
The worldbuilding. In one word, it was STUNNING. Generally Xianxia dramas pay a lot of attention to the graphics and everything, but the fantasy world was so real and believable, absolute feast for the eyes. The costumes, the set designs, the VFX, and even the fancy flying fight sequences and all, were quite well executed. This experience was made for a big screen, I feel. The OST was also quite good. It's still stuck in my head.

Cons-
Luo Yun Xi as the Male Lead. Honestly, I didn't like him in the first watch, but maybe a rewatch after sometime might change my opinion. In my opinion, he was TOO THIN. I get it that one aspect of his character demanded him to be sickly and thin, but for me, his stick figure thin body just stood out like a sore thumb. And his long, flowy costumes didn't work for him either, made him look thinner. I was SORELY missing Dylan Wang in this regard, because he looked like a BOMB as the Devil in LBFAD. Even his acting felt a bit wooden to me in parts, but maybe that's his character's demand. Again, hoping that a rewatch might change my opinions.
Editing. It was choppy in parts, sometimes the scenes would just transition from one to the next without any connection between the two. Quite irritating that was. Also, the additional villains were just stupid and unnecessary.
Ending. I do not like dramas that do not provide closure at the end. AND THIS WAS ONE SUCH DRAMA WITHOUT ANY CLOSURE. I legit went back to search if there are extra episodes after the 40th one, because THE ENDING WAS SO INCOMPLETE. I get it about sad endings and all that, but keeping it open ended without any explanations and so abrupt was just ANNOYING.
Overall, the lead couple's love story and their chemistry was what shone the best in this series. This made me watch Love is Sweet, because I was vouching for them so much. Although I didn't like the look of Lui Yun Xi in this drama, I loved his character. But Dylan Wang will still be my favorite Devil. Give it a watch, it is a decent one.