I didn't dislike any of the companions, but I probably used Kana the least? He just seemed a bit detached from everything else that was going on in the story, besides Caed Nua and the Endless Paths, plus he just isn't really the kind of character I personally tend to gravitate towards. If he'd had a personal stake in the goings on in the Dyrwood I probably would have dragged him around a lot more. Sagani and Pallegina have a similar problem, but I also just liked them more as characters, so no accounting for taste and so on.