And this time no silly unhistoric things like geisha and ninjas, only 8 nation, having a distinct cavalry unit, stupid movies.

Geisha, Ninjas, and 8 clans are not as unhistoric as you think. The only thing really out of whack is the Geishas, and that is only insofar as they were not historically used on the same scale as the game does. If you want to complain about unhistoric, the way Samurai fought is not the way they do it in the game, but to realistically depict samurai warfare would really just be too confusing and complicated.
There were 8 major clans that had major historical impact, and to a limited degree, the unit specialization is correct (Mori clan was famed for its adherence to Buddhism, and thus warrior monks did serve in greater numbers with them).