Yes, Ran is one of the best samurai films ever made.
Regarding the first thread, I would like to mention that the red armor is better then the black (gray) one, what makes those armors a complete failure is how the yodare kake (throat guard) is fixed to the chest rather then the mask, it makes the whole thing look silly, it's an unforgivable mistake.
Then there is the classic mistake of the arms and legs that are armored on the backside even though they shouldn't be, the feet look almost like European sabatons rather then Japanese kogake.
Some of the mistakes can obviously be fixed by retexturing them, but some things are model problems and take more work to fix.
Also a commonly seen mistake is that the sode (shoulder guards) are often more curved then the should be (that does depend on the type though), but typical tosei sode are almost flat, I can barely get the top of my finger underneath it if I put a sode on a table (you will see this mistake in Shogun 2 as well).
Another common mistake is the lace, you will often see weird patterns or the infamous X's and traintracks pattern (the lace is not wide enough and will show gaps where they shouldn't, you can often see it on poorly restored antiques or crappy replicas).
I agree with you that most samurai armors for Mount & Blade are inaccurate... very inaccurate, and do not fit any time period.
And yes, I really did count the mistakes on the armors of Shogun 2, the sad thing is, the models are well made and textured, and they got a lot of things right, it's the details that screwed it all up, mismatching armor pieces (sometimes as much as 3 different styles), the ugly arms that had severall mistakes, the worst being the hands with the large loose fitting finger... flaps
they might as well have added some clown shoes too, to make the picture complete.
I should stop about that, I might ruin the game for you or other people if I were to make a long list.
Shogun 1 is a bit more accurate, but only because it has less content, one thing that also really bothered me about Shogun 2 are the castle walls, they have this ultra long horizontal window or gap in them... seriously!? Why? Just because they screwed up with AI path finding and had to make it so that walls were easy to pass... just silly, and unforgivable.
Hey, if you want, I can answer some of the questions you asked in other (older) threads, not that Ron did a bad job at it, but it can't hurt to get a collectors opinion.