These are just my thoughts and I'm not an expert whatsoever
Pros: actors and actresses, photography, scenery, colours.
+ Benedict and Eloise are lovely and their stories are the most interesting at the moment, either because I'm curious about how they'll tell certain situations or because I have no idea where they'll go. (I didn't read the books)
+ In general I liked the characters, I don't likelike all of them, but I like how they're built. They're not the reason I didn't appreciate the show.
+ Sibling's scenes:
Eloise and Benedict smoking, Daphne Anthony and the warm milk, Colin in general, Eloise and sweets...
CONS:
1) Plot: I found it full of clichés, ridiculously predictable and absurd at the same time. If you look to a list of romantic/drama clichés and then you put them in line you have the plot of the series. It's also true that sometimes very predictable plot are very enjoyable because the narration of the facts is compelling. For me, this is not the case. I found episode 4 absurdly ridiculous.
Instead, despite the fact I got it since Ep 5-6, I liked the revelation at the end of the season. Again, I'm not an expert. This is just what I've liked and what I didn't.
2) Absence of disclaimer or tw at the beginning of episode 6
3) Absence of Simon's point of view regarding what happens in episode 6
4) Costumes: I didn't like the costumes at all, they looked modern, but I'm not an expert so instead I advise to watch Karolina Żebrowska's video regarding that department.