We had a party of five for dinner (who all sat quite comfortably in one car and believe me, we ain't small people!) in January. I must say that the food was not up to par (our worst meal for the whole trip and my step-dad had a fit over the bill (which began our nightmare trip with him, but that's another story)).
I had the Coca-Cola ribs (which since I'm from the south were a bit laughable) and a cookies and cream milkshake (which was to die for!). My step-dad had the steak and he said "it could line his shoes", but like I said, he's not the most pleasant of people. DBIL also had the ribs and he felt the same as me about them, DM also had the steak and she liked the seasoning on it but not the steak itself, and DS also had the steak and also gave it two thumbs down (although after three Red Lava drinks, she didn't really fuss too much). The neat thing about the drinks is they come with these "ice cubes" that are really plastic lights that glow. She still has hers and they do still glow!
I think the Sci-Fi is more of an "atmospheric" place than anything. I did a ton of message board reading before we left and most people agree that lunch is an OK meal to have there. But DM and I had already been to Brown Derby and we wanted to try something new. MGM is quite lacking on restaurants (which is a shame because it's my favorite park).
I do hope you get the seating arrangements you want because despite the so-so food, the atmosphere is amazing!!