Could you maybe expand on why Japanese movies are bad?
Are they at least appealing to the native culture?
I've touched upon this in the post you quoted but essentially there is funding for Japanese movies, but it's not on the same level as Hollywood.
A lot of Japanese actors aren't that good. The performance just isn't believable half the time, and a lot of times characters are written to be single dimensional. If there's a character that's going to be a love interest, THATS their ONLY role. Showing personal conflict doesn't happen a lot.
A lot of movies are based on novels/ manga or dramas. There is a focus on yearly releases for a lot of anime movies (Doraemon, Shin-chan, Pokemon, etc). I'm not too interested in those so I can't comment too much.
Representation of foreigners or the West is also pretty bad. They tend to lump foreigners into the comedy role. Foreigners will be played by Japanese. Remember, black face is still a thing in Japan. Lots of "Japan is the best!!!" moments on TV and in movies.
Special effects just aren't on the same level as America. It might be budget constraints or just experience.
There are some good Japanese movies.
Kurosawa and Beat Takeshi are two of my favorite directors. They've also pushed their genres considerably.