People seem afraid to give this one less than 3/5, so I'm going to go for it with a slightly lower 2.5/5. It's boring! It's beautifully shot, sure, but it's dull. I don't think it should be labeled as belonging to the action genre, because this is... I don't know, it's not even really a drama. There's a ceremony to pick a new abbot at a monastery, there's a scroll a few people want to get but it's hidden away, and there's political intrigue after the decision regarding the former event is made.
But the film slouches awkwardly from one thread to another, and much of Raining in the Mountain feels like numerous scenes stitched together, the only through line being that the movie is set in one fairy confined location. Okay, that's something. I'll concede. But I found very little rhyme, reason, or rhythm as to how those scenes were placed together. There was no flow, there were no interesting characters, there was little action in what I thought was a martial arts movie, and some of the music was so annoying (it drove me insane during the chasing/sneaking scenes, and there are many).
King Hu was on autopilot with this one, I think. Every other films of his I've seen is better, or has more to offer. I was enamoured with the first couple I saw, but digging out his deeper cuts has been diminishing returns to some extent... though this is the first one I found really disappointing. If you want something spiritual, atmospheric, and maybe thematically rich (if you want to dig deep or whatever), maybe there's something to be gained from approaching this with that frame of mind. And yes, it does look very good; I can't entirely criticise the visuals without being petty or unfair.
Actually, I would just say watch King Hu's similarly named Legend of the Mountain instead, which came out the same year, is longer, has even less action, but definitely has something to it that makes it compelling and easier to get lost in/hypnotised by.