One of the best drama series so far I wish I could give this fantastic series a 10/10 score rating, but some of the major and minor flaws which I couldn't disregard or overlook forced me not giving it a full score.
The first major flaw is the cast of John Blackthorne played by Cosmo Jarvis, who in general, is not a bad actor, but if compared him with the older version of Shogun played by Richard Chamberlain, cast him as Blackthorne is not a good choice. His height is a bit of short that made him obscure among the Japanese actors, even among the female ones, his didn't stand out as a Western white man. During the ancient time, the Japanese people were short in general, if cast an average height white man like Jarvis is an obvious flaw. Furthermore, other than his height is not tall enough, not only he looks too ordinary, but also without strong charisma.
The second flaw is Anna Sawai, who plays Toda Mariko. In this series, Mariko can speak Portuguese and English. But her English is too fluent and too American. In that era, only a few Portuguese missionary monks in Japan, the American military ships and merchants were not yet presented, how a woman could speak such fluent and perfect American English without even an error or even a stutter to find an appropriate English word? More ridiculous is she could instantly translate the Japanese into English without any hesitation like those professional translators working in the UN council.
What makes this drama series so great, on the other hand, is also the great casting. Hiroyuki Sanada, Tokume Nishioka, Shinnosuke Abe, Tadanobu Asano, Moeka Hoshi, and Takehiro Hira...All of these Japanese actors are so great. Especially Mr. Sanada, who played Yoshii Toranaga. Mr. Sanada is like a rare vintage wine, too good to not mentioning here.
The setting, the costumes, the dialogue (except Mariko's fluent English), the soundtrack, the special CGI effect, the directing and editing...All of them are near-perfect.