No you're really not getting it. Calling a 64 buick and and the Cadillac both cars is like calling both Inception and Transformers "films." Its a matter of not are they both films, they are largely made for the same audience. Interstellar is many things but I'd hardly call it sophisticated. Both films are essentially minivans. One just has a motor that actually runs, a nicer interior and input from a fluid mechanics expert to make sure the cup-holders won't theoretically spill your coffee.
My point is that so many people want Interstellar and its ilk to be GREAT IMPORTANT FILMS when that's not even really what the people making them are going for.