Kit is wounded in the Napoleon wars, but his problems after returning to civilian life are more about survivors guilt. He thankfully doesn't try to deal with these issues in the cliched manly way by drinking / gambling or womanizing. Kit is depressed, and behaves more like a lion roaring because he has a thorn in his paw. His backstory of having a grandfather with "melancholic" temperament, which because of the events in his life has triggered something similar in him make sense.
Chloe is an calm woman, a poor baron's daughter (aren't they peers too?), so is an aristocrat by birth, however behaves more like a vicar's daughter (poor casting / backstory). I guess she was made a baron's daughter to make it more plausible for Kit's grandmother to consider Chloe in her match making scheme. When she is left without money and nowhere to go after her father dies, Chloe thinks she is hired as a companion to Kit's grandmother, but soon learns she is instead a companion / marriage bait for Kit instead. She thankfully is not a chirpy cliched teen, but a spinster of 26 with a calm temperament. But she does not have anything else going for her.
The story of Kit's and Chloe's HEA is an easy read. No wrenching drama or sob story. Of course, there are a few cliches. Kit is handsome. Chloe is not beautiful, passably pretty, apparently intelligent (however she doesn't get to show it in the story, and it is just mentioned in passing), and of course an innocent / virgin.
"I liked it" rating is essentially because of the hero behaving as a decent person even when he is lost emotionally / is in emotional pain and confusion. He is rude and hurtful, i.e. he is not perfect, but not completely oblivious or careless with others. Why don't we have more of this kind of hero in good romance stories?