The Quintessential Quintuplets wasn't particularly a passionate read for me. I wouldn't say that I had a bad time, but overall, I feel there are many unhealthy and unconstructive messages in the story. The main characters have a complicated relationship with their studies, and the author tends to reinforce the elitism within such an intolerant system rather than being critical of a situation that isn't beneficial for anyone. Additionally, the main girls are often portrayed more as rewards for the reader rather than fully fleshed-out individuals with their own lives. I believe this objectification of the quintuplets is what significantly deteriorated the overall story.
However, there are also a few positive aspects scattered throughout, primarily the way the story showcases the individuality of each of the quintuplets. Based on their unique personal experiences, each one ends up being different in certain ways, and the story gradually reveals these experiences. Towards the end, the manga delves deeper into this direction, and I appreciate the development the story takes in the final pages.