If you are able to score a reservation at the Space 220 LOUNGE you can enjoy the cool factor but will find a much more affordable menu. I also think you can't beat Sci-Fi for the ambiance, fun and affordability... it's burgers and shakes, no fine dining menu here... which is fine with me LOL
I've eaten at BOG many times when it was serving QS, not the fixed menu so I can't comment on that food. I'd usually head for one of the smaller side rooms, but if you are in the big ball room, it's like being in a glorified airplane hangar! And is it loud!!
For the price, I'm with others, CRT is iconic and you can never go wrong there if you want something special. Is it worth it purely for the food, I’d say no... but lets be honest, that's not why people book it... they go there because it's the castle!