I did see about the last 45 minutes or so. The acting was a bit dated, though the final scene was effective when Leslie Howard has returned from the cemetery in the present day, having discovered that the woman he loved in the past (in the 1790s) had died shortly after he met her in his journey through time.
I think the remake with Tyrone Power, "I'll Never Forget You," holds up better today, and it's available on DVD as part of a Tyrone Power boxed collection.
Interesting that Lovecraft was so enthused with the movie.