The problem I'm having with Kirai is that the crew doesn't excite me (I know this might not be a bad thing, but she was my main master for several years).
Kirai, Ikiryo Datsu and Seishin are all fine, and quite fun to play with, but after that the crew falls off. Kirai couls use another more interesting action (I'd replace soothe spirit, as there's enough of that within the crew), but that would be it.
Francis fills a smilar role to seishin, and then all the other models are just progressively weaker damage dealers. I feel there's little decision making process in the summons. In 2nd ed I chose between hanged/goyro/shikome/drowned depending on the situation, now I don't see why you wouldn't just stick with goyro. There's also no reason to summon the smaller models, as she doesn't have the multiple rule other summoners do (meaning Onyro and Gaki are back to being incidental summons). I'd like to see a bit more diversity/utility within these models.
Jaakuna adds very little, when she could actually be turned into an interesting support piece.
I wouldn't say the crew is underpowered; it deals quite a lot of damage, but that's about it. I'm always looking out of keyword for most schemes/strats (something I feel 3rd ed is trying to move away from). When looking at picking a crew, I generally struggle to see why to choose Urami at the moment.