When you think of Raiders of the Lost Ark, you think of the Raiders March.
When you think of Star Wars you think of the Imperial March.
When you think of E.T. It's hard not to hear the theme in your head.
When you think of Patton you hear the echoing trumpets.
When you think of Psycho you hear the screeching violins.
When you think of Jaws...etc.
But when you think of Interstellar Ah... I think of ah... irritating drones and loud swaths of sound.
When you think of Batman Begins. Ah... Yeah... what is it? Arpeggiated synths with a block chord string progression?
When you think of Inception. Ah... I think it's a chord progression that just gets louder and louder and now my head hurts.
I believe this all started back in the 90's when documentary filmmaking style was in vogue. Themes and old school film scoring just doesn't work very well for that gritty, raw, what-you-see-is what-you-get style. I think that was when the sound designs and bass drones became popular and now they are just used for everything. Oh, that and beats. Everything has to have a completely inapropriate dance beat to it now.
Don't get me wrong. I'm not saying everything on screen has to have a theme or melodies. in fact, some of the aforementioned examples above are not themes or melodies at all. But think of a movie (not sequels or reboots of older material) made within the last twenty years that has a discernable music accompaniment and is memorable. They just don't do that anymore and I think it's a shame.
And Errikos is right you don't need a big orchestra to make a good score. I would add Carpenter's Halloween to his list. Nor do you need a score at all, I've mentioned Goodfellas on another thread as an example of a montage of Pop songs. The film has no original or even incidental music whatsoever it's just Pop songs strung together in a clever way.
Also, I'm not necessarily bashing Zimmer. As I mentioned in a previous post I liked the music to Rainman. In fact when I think of that movie I think of the minimal in-your-own-little-world score Zimmer composed. I also liked his score to the first Sherlock Holmes movie although it did kind of remind me of Morricone's score to The Untouchables.