A few comments:
The show never really decided whether it wanted to be drama or soap opera. Is this show Law & Order (drama) or is it Dallas (soap opera)? If they choose soap opera, then Ivy and Karen have to do a lot more slapping each other's faces. That needs to be decided by Season 2.
I think the show works best when we see a Broadway musical in the making. All the other subplots (Dev's career, half-wits running away should be dropped).
It's hard to believe that anyone associated with this show knows anything about musical theater. We all know the Patti LuPone losing her voice during Evita tryouts and Terri Klausner going on. Setting up that dynamic between Ivy and Karen would be more interesting.
The writing needs to be improved. The director opens a door to an alley and low and behold Dev is standing there? Half wit brings his parents fish and chips and Dad likes his with vinegar? Need better writing.
Glad to see Ann Harada with more screen time. One of the great things about "Slings & Arrows" was that we got to see things from the long suffering stage manager's point of view.
McPhee is not really Marilyn. She's too skinny to be a sex object. But Hilty has too hard of a look to portray the innocence of Marilyn.
The final song, while nice, really isn't right. Marilyn's image is one of the most iconic in history. It's everywhere. Who's going to forget Marilyn? Don't forget me? History won't allow us.
If anyone ever tells you that you put too much Parmesan cheese on your pasta, stop talking to them. You don't need that kind of negativity in your life.