Getting back to the movie, I found it interesting but ultimately a bit of a disappointment, probably because of the hype about it on some of the wargaming and naval Yahoo groups. As a human interest story showing the Japanese side of events and the cultural aspects of life on board it was good, but the "spotter" in me wanted to see more of the ship. The final sinking of the Yamato was, IMHO, an opportunity missed (one minute heeling but there, then an arty (but admittedly rather good) underwater shot, then a pillar of smoke. It could have been so much better. The CGI aircraft were patchy - sometimes good, sometimes performing manoeuvres worthy of a TIE fighter!
Like a lot of Japanese movies, Yamato suffers from a lack of sufficient comparative buget to something like, say, Pearl Harbour. I also would have liked to have seen more of the ship, but on the other hand, it's probably the best we can hope for. I doubt if an American production company are ever likely to make a movie about the Imperial Japanese Navy.
As for the subtitles, I saw it in the original Japanese. Some of it is hard even for a Japanese to properly understand (e.g. the discussion of bushido prior to the Yamato sailing to Okinawa). I don't know which bits are or are not good translations.
Overall, very much a worthwhile watch I thought.