Exactly. Effie, whatever she looks like, HAS to have a powerhouse gospel/R&B voice that's not pop-sounding and Deena HAS to be stunningly beautiful with a light sound or the show doesn't quite work. Remember, part of what Curtis sees in Deena is dollar signs -- Deena has to have a smooth, pretty "white-sounding" (with a little bit of soul) voice in order for the group to crossover to the pop charts, and be able to be turned into a glamorous-looking star so she can help them get into the segregated clubs and onto the magazine covers.
It's arguable whether Curtis ever feels anything romantically for either Effie or Deena -- he sleeps with Effie in order to become the Dreamettes' manager and to keep her in line, and then later pursues Deena when he knows he can fire Effie at anytime, make Deena the lead and turn the Dreams into the big crossover success he's been planning for. He sleeps with Deena in part to control her and manipulate her into rejecting her childhood friend, getting her to choose him and the Dreams over her (not that Effie's behavior doesn't make that decision a little easier for Deena).
I've seen Curtis played as a cold, slick, amoral, manipulative operator who doesn't care about or love anyone, but himself and seen it really work. Vondie Curtis-Hall (who replaced Harney) played it that way and when Deena was ready to leave him at the end and he sang a few lines of "When I First Saw You" to try and convince her to stay, you heard a round of catcalls from the audience -- they had seen through him and HATED him and when Deena walked out anyway they burst into applause.
And you're not the first to complain about Frenchie's acting (the reviews said the same thing) -- too bad really because she has quite a set of pipes on her. I hope she's working with a coach or something because she'll only go so far on voice alone if she wants to do stage (Holliday wasn't the world's greatest actress by any means, but Bennett worked with her intensely for months and basically beat a solid acting performance out of her).
"What a story........ everything but the bloodhounds snappin' at her rear end." -- Birdie
[http://margochanning.broadwayworld.com/]
"The Devil Be Hittin' Me" -- Whitney