Re-watching
I had watched season one when it originally aired, but I wasn't super into it at the time. The episodes would build up on my DVR, because I never wanted to watch it, but when I did, I would enjoy it somewhat. It was better than Glee, at least.
I remember being torn between wanting Ivy to get the part, or Karen to get the part.
Well I finished re-watching season one, and am not sure why I ever thought Karen should have played Marilyn. I like Katharine McPhee as a singer and actress, and she's one of the most beautiful women I've seen. However, she looks, sounds, or behaves NOTHING like Marilyn Monroe. Ivy is heads and shoulders above her.
Now I'm just two episodes into season two, and I know it kind of moves away from focusing exclusively on Bombshell (sadly), but even just the few numbers so far re-emphasize how there's no earthly way Karen would have been considered to star in Bombshell.