If his music sounds "the same", it is partly for some of the movies being "the same". In several cases, he was writing music for sequels of movies he had already scored, so there is no helping that. Had he not been tapped for so many sci-fi/franchise epic films he might have been seen in a different light. His scores for two Mark Rydell films - The Reivers with Steve McQueen and The Cowboys with John Wayne are nothing like his Star Wars/Superman scores. The Cowboys is one of the great western scores, IMO.
"The Magnificent Seven"(the real one with Steve McQueen, Yul Brynner, Charles Johnson) is the other.