After burning through most of my accumulated resources, I've got most of the generals. The ones I'm still missing are:

Spring Reunion generals:
UR Ii the Scarlet Oni
UR Kuroda Nyosui (C)
UR Takeda Shingen (C)
SSR Gotou Nobuyasu
SSR Hohjo Ujitsuna (B)
SSR Nabeshima Naoshige (B)
SSR Asakura Yoshikage

Other event generals:
UR Vessavana of Dominance
UR Sanada Yukimura (S)
UR Uesugi Kenshin (H)
UR Saitou Dousan (X)
SSR Hideyashi Hidesada
SSR Uesugi Kenshin (S)
SSR Gamo Ujisato

Other generals:
UR Tsukahara Bokuden
UR Oni Shibata

In particular, I'm only missing two that are in the soul summon. I've also got almost enough resources left to get all of the generals that I do have to at least three stars. I'm only 10 koban short, though that will be 410 after I use some EVO cards on a UR Princess Kaihime to inherit.

So while I didn't quite get everything, I got pretty close--and without spending any money besides the monthly pass since the monthly pass was introduced not that long after the game launched. As "pay to win" goes, I'd say that's not bad.