Emily

This is the best portrayal of enemies-to-lovers I have ever seen. In the beginning, they seriously hated each other, and not just a mild dislike. The ML was honestly a jerk, and I admit to hating him, just a little. But seeing the way their relationship morphed and shifted into love and admiration made me love them all the more, because it was so realistic. And don't even get me started on how hilarious they were. They bickered like an old married couple, and I sat for every second of it.
On to the side characters.
OMG, I loved the generals so much, they're freinship so much, and watching them healed me. Every character was done and developed so well, from the Wie household to the FL's own family, I was impressed. Even the villains had so many layers to their characters, which a lot of dramas cannot seem to do.
Now for the stuff I didn't like (SPOILERS):
I feel like anyone who has watched the show is going to have the same complaint: the deaths.
I mean, I think it's just cruel to make the audience care so much about Wei Liang and then just kill him off. The same goes for the FL's cousin. All she wanted was to live a peaceful life with her husband, and she ended up giving it all up.
This was entirely unnecessary and felt like their deaths were only done to cater to the genre itself, rather than to serve any real purpose to the story, because I would have been perfectly fine if they were alive and well, which they were in the original novel.