Unlike a lot of reviewers here, I was quite impressed by this film. Sure it's not scary - I didn't expect it to be - but it effectively builds an unsettling atmosphere without resorting to the usual mood enhancers such as haunted houses, gloomy mansions, isolated islands, etc. Prosaic things such as a spark generated from a railway wheel, the taking of a key, have an edge to them. There are also some very nice touches along the way, eg, the dog bringing the slippers to Carole Lombard's brother.
It is also interesting to see Carole Lombard this early in her career - from my point of view she acquits herself quite well in the part. And H. B Warner is also well suited to his role of Dr Houston. Randolph Scott however is wooden, and the role of Bavian could have done with a more charismatic player than Alan Dinehart. The real scene stealer in this movie however is Beryl Mercer - much better in this than anything else I have seen her in.
I also find this film interesting plot-wise, as I have on occasion come across texts which refer to "The Uninvited" as the first significant Hollywood film to deal with spirit possession when clearly this is not the case. I suppose it depends on what you mean by significant.
Anyway, it is certainly interesting to see what the makers of "White Zombie" came up with when they had the backing of a major studio.