Sarith,
Interstellar is not mastered in Atmos, so not sure how much we can put the weight on it.
As for Atmos and wow factor, a lot depends upon the mastering. If a recording engineer takes advantage of Atmos and create an enveloping sound field, then Atmos really shines compared to 5 channel mixes.
So far, the best recording that takes advantage of Atmos is Gravity. You can literally track the sound as it moves around you, depending upon where the astronauts are. Edge of Tomorrow, Planet of Apes is also very good in Atmos.
Again its a tool in the hand of recording engineer. If they don't take advantage of what it offers, its not the fault of the tool.