I have not watched "Kagbeni" yet, but am looking forward to it, once its DVD becomes available.  (BTW, is it out yet?  And if so, where can I buy it in the US?) 

The reviews were raving:  A new kind of movie....  Not your typical Kollywood movie that imitates Bollywood.... Actors did tremendous job, particularly Nima Rumba.... Director Dahal turned out to be really good at his job.... etc. etc.  Needless to say, my expectations have been raised, I hope the movie will match the hype.

As for the similarity of Kagbeni to The Monkey's Paw, I think the makers of the movie explicitly said that the latter is the inspiration of the former.  Ram Gopal Verma made it clear that his movie, Sarkar, is inspired by and homage to Godfather.  When one gives credit to where credit is due, I do not call that plagiarism.  In fact, I find that worthy of respect.