I see a lot of criticism about the uninteresting villains that Superman has faced off against but I have never personally seen that conflict as important to his character development.
When I see a Superman movie, what I am looking for or alternatively what makes him my favorite is the way he against his own limits or the circumstances he is in. Of course what his limits are, are always variable or how tough his circumstances actually turn out to be is subservient to the plot and which is why an actor playing Superman needs good acting skills to portray that 'struggle'. The accompanying music also plays a big part.
For example, in 'Man of Steel', Superman's first true flight, his rescue of Lois and the destruction of the World Engine are scenes that can swell any fan's chest with pride. More than the fight scenes, these majestic visuals are what define a Superman movie.