Here's a point, what viable ways are there to flip her on T3 when she hits? Walking Ballista and Neonate spring to mind. The question then is, why bother? R/B Vamps doesn't want her, even if most of her modes offer some kind of synergy.
Well even if she doesn't flip, she acts a bit like some pseudo-Archangel Avacyn, since suddenly all your other creatures are "invulnerable" and cannot be traded. If she eats removal and dies immediately, that's still not a bad outcome since chances are the opponent had to spend a premium removal spell on it. If she does flip the +2 mode is OK as an extra means of pressuring the opponent.
I didn't play during Origins outside of farming the AI, so I have no idea what it was like then. Still, I think there's a deck out there that incorporates Liliana, Heretical Healer. She won't be a star player but she could be a reasonable card in the deck. Some kind of B/R midrange deck with some madness cards, Vengeful Rebel & Fatal Push, and value creatures to trigger the sacrifice (Fleshbag Marauder, Deadbridge Shaman). Kinda sucks that she shares the same CMC as Liliana, the Last Hope though, as well as three of the four cards mentioned above. Or maybe some B/W deck with the revolt cards, Walking Ballista, Avacyn, a few angels or humans, and Bruna (Liliana, Heretical Healer is a human too!). Sounds a bit contrived but maaaaaybe. I might get to brewing it after I'm done with the B/R/C deck I'm currently working on.
On a side note sure Chandra is a bleh creature, but then so are Nissa and Jace. If they didn't have a flip side I'm pretty sure they would not see play.