Holy S%#t, where did you stay?
I think the worst place I've ever been in was a Ramada in Chicago. The door frame on the first room they put us in was so worn down that even when the deadbolt was "locked" you could wiggle the door about an inch. The second room was better, but I didn't notice until the next morning when I was in the bathroom that the word "MURDER" was carved into the back of the bathroom door in 8" block letters.

"Grab your stuff, honey, it's time to go!"
Honestly, I don't think I've ever had a bad meal at Disney. Sure, there have been some that I felt were overpriced for what I got and probably won't do again, but all of the food was good. CRT is a fun time, just be prepared to be called "my lord" a lot. But don't let it go to your head - your DW will
not continue to call you that after the meal. At least mine didn't.

I'm a fan of Le Cellier -the food was outstanding. It is close to that "over priced, might not go back" range. I believe it changes to a Signature Restaraunt (2 Table Service credits if you're on the dining plan) in March, so I'm very curious as to what they will be doing with it then.
Never been to SciFi, but it's on my list of things to try. Let us know how it is!
I've never been with that many before, but I would suggest splitting up into smaller groups. Plan a few times each day to get together (meals, fireworks, etc). I just can't see moving that many people around at once.
Or, just get a Brazilian flag on a long pole and have everyone follow you that way.