For me, I'd rank something like this (Very Hard/Legendary/Short campaign):
(Easy to hard) Shimazu, Oda, Mori, Otomo, Hojo, Chosokabe, Ikko Ikki, Tokugawa, Takeda, Date, Uesugi, Hattori
Date has huge issues getting going as it takes so long to get to the next provinces at the beginning of the game. On the higher difficulties this means that the AI has tons of time spawning up armies before yours gets there. By the time you've gotten over this by expanding all the way down to Edo or so, the difficult part of the campaign is mostly over