Harry was the best character in my opinion. I liked the fact that Evelyn, Celia and Harry were all written with flaws. You can't say someone was simply bad or good. I also liked Evelyn's friendship with Harry much more than her great love with Celia. I feel like they had greater connection and like they were true platonic soul mates.
Even tho it seemed unrealistic at times I loved how tragically written some parts were. I love how people aren't written as black and white and how some situations, as bad as they objectively seem, can be looked at differently once emotions come into play.

I don't think writing style was that bad, but I'm a sucker for deep love quotes, so I missed that, but all in all, I'd give it 8/10.