Yasuke is actually a fantastic choice as far as history/narrative goes.
A shame the game looks like more generic Assassin’s Creed Mapfucking+Crowd Supermurder.
Which is fine if that’s your thing, but I haven’t been thrilled by an AC game since… well, AC1.
There is a second playable character that does all the stealth, an actual ninja. It looks like most of the missions will allow you to choose which character you’ll play. So no, Yasuke is still a great choice - for those who don’t want to play that way.