+4
The 36th Chamber of Shaolin is great, and is probably the one I'd pick if I had to introduce somebody to Shaw Brothers or the kung fu genre as a whole, although there are others I prefer slightly. If you ever have the opportunity to see it in a theatre, I would strongly recommend doing so (assuming you feel safe/comfortable). I used to be fairly indifferent between seeing a movie at home versus seeing it in a theatre, but experiencing a Shaw Brothers retrospective with a properly enthused crowd is something you can't replicate at home.
I rewatched Yojimbo last year when I was doing the Criterion Challenge on Letterboxd (which was supposed to be focused on new viewings, but I was feeling lazy and also wanted an excuse to watch the pile of Criterions I'd acquired over the years). As you argue, it's a a great entertainment (love the way Kurosawa will have the action ricochet across the edges of the frame as the hero dispatches any number of baddies). But this time around I tuned in more to the way Kurosawa critiques the way society conflates institutions and authority with morality, when the former is shown to be corrupt and worthy of derision while the latter is demonstrated by the supposedly disreputable hero acting against his own self interest. It's a "lighter" movie than some of Kurosawa's other masterpieces, but there's more depth than I'd initially given it credit for.
I owe Wrath of Khan a rewatch at some point. I only saw it in high school and preferred a few of the other TOS movies at the time. Mainly my reference point for it is how badly Star Trek Into Darkness handled similar material (and I say this being a fan of the 2009 movie).