I think the award is also for Theme Park - which Silver Dollar City does extremely well. Yes, they could use a nice long ride (hyper or giga) but the ones they have were top of their game when installed. But the main reason my family loves going to SDC over anywhere else is because there is something for everyone: Shows, Rides, Shopping, and Food. Also, the cave is pretty cool too.
Same reason my family loves to go to Busch Gardens, Sea World Orlando, Disneyland, etc. There is more to do than just rides, carnival games, and bad food.
I'm not 100% sure how SDC beats out Universal, or some Disney parks - but SDC does an excellent job campaigning for their park.
Jay