Then there is the net collective value of all those reports. If the business (any business) has 4.5 stars and 10,000 reviews, and the bad reviews are sprinkled throughout, those would be anomalies.
On the flip side if the business has 1.5 stars and 10,000 reviews, the good reviews would be anomalies.
So let's take a look:
Magic Kingdom 4.5/5 rating and over 21,000 reviews:
http://www.tripadvisor.com/Attracti...95-Reviews-Magic_Kingdom-Orlando_Florida.html
EPCOT, 4.5/5 over 7900 reviews
http://www.tripadvisor.com/Attraction_Review-g34515-d126541-Reviews-Epcot-Orlando_Florida.html
DHS, 4.5/5.0 over 9800 reviews
http://www.tripadvisor.com/ShowUser...sney_s_Hollywood_Studios-Orlando_Florida.html
Animal Kingdom, 4.5/5.0, over. 12,000 reviews.
http://www.tripadvisor.com/Attracti...-Disney_s_Animal_Kingdom-Orlando_Florida.html
This isn't to say that a bad review means nothing.
If I am reviewing anything on yelp or trip advisor, of the large majority of people are having a great or very good experiences, I would consider that a sign of the norm. I will review bad reviews to see what was up--a lot of times they are valid but not deal breakers. Others are exaggerations. Others are false expectations like the European being discussed on the resort board who came to America expecting food like home and expected things to be more fair for him at the Grand Floridian.
Perhaps it is you who does not understand these reviews. If 99 people are happy and you decide to believe the 1 disgruntled customer as the norm, not much an be done to convince you otherwise.
ETA: to be fair, I did check IOA and USO and they shared similar ratings.
IOA 4.5, 19K+ reviews
http://www.tripadvisor.com/Attracti...l_s_Islands_of_Adventure-Orlando_Florida.html
USO 4.5/5.0, 11K+ reviews
http://www.tripadvisor.com/Attracti...niversal_Studios_Florida-Orlando_Florida.html
And while we are at it
Busch Gardens 4.5/6K reviews
http://www.tripadvisor.com/Attraction_Review-g34678-d107648-Reviews-Busch_Gardens-Tampa_Florida.html
Sea World, 4.5/14K reviews
http://www.tripadvisor.com/Attracti...Reviews-SeaWorld_Orlando-Orlando_Florida.html