I enjoy Stevenson a lot, but I think "Catriona" is one of his weakest novels. Nowhere near as fun or well thought-out as "Kidnapped". I really liked Stevenson's "South Sea Tales": they give an interesting insight into the Pacific Islands, and were unpopular with Victorian readers because they are so critical of empire and give the indigenous Pacific Islanders such full characterization. That being said, it's still a product of its time, but it's interesting to see how much Stevenson develops as a thinker.