How much of Wonder Woman's greatness comes from lowered expectations?

I remember when Spider-Man 2 came out in 2004 a lot of people thought it was great because of the plot, the interesting characters, and their developments.  My thoughts were, Aren't those things movies are supposed to have?  Had movies gotten so bad that when a movie finally did what a movie was supposed to do we didn't know how to react and just called it great?

So what is Wonder Woman in and of itself?  Your basic superhero movie done competently.  Have superhero movies gotten so bad that when one finally does what superhero movies are supposed to do we don't know how to react and just call it great?

It's like if a student had four tests and the grades they received were: 55, 27, 25, and 93, you'd flip out at all the hard work they did to get that 93.  But if the grades were: 85, 77, 75, and then 93, would it have been so special?  (In case you're wondering, that first set are the Tomatometer scores for Man of Steel, Batman v Superman, Suicide Squad, and Wonder Woman as I wrote this up.)