Wow! Thanks for all of the votes, everyone!!!
I'm not surprised at all to see that Sci-Fi and Mama Melrose's got a lot of votes because they continually get bad reviews here on the DIS. We have had lunch at Sci-Fi once before (we ordered burgers, fries, and shakes) and they were fine, and the kids enjoyed the atmosphere.
As for Mama Melrose's, IPO just emailed me back yesterday with all of my ADRs confirmation numbers, but the night that we wanted to eat at MM, there were no available times open. She told me that Studios is only open until 7pm on that evening, so now I'm wondering if we should just choose someplace else/different park.
50sPrime Time is OUT because my DS16 loathes the place. LOL I'm unsure of the Brown Derby. We had lunch there once and I wasn't overly impressed with it. I'm considering changing our itinerary so that we're in a different park that evening which would give me a choice of other restaurants.

Also, if the park closes at 7pm, would there even be a Fantasmic! showing that night??
I am very surprised to see Marrakesh get so many votes! We've had lunch there twice and thought the food and service were great! Can those of you who voted for Marrakesh please tell me what you didn't like about it?? Thanks!
Thanks again for all of the votes, everybody!