Tolkien borrowed a lot to build his world, but then he told an original and engaging story with it. That's the difference between Tolkien's fiction and Warhammer Fantasy, the latter recycled worldbuilding material to tell recycled stories and there was rarely any stakes or engagement. It was a cool enough world to tell your own stories in if you played WHFRP but the metaplot was incredibly stagnant.
Also Sigmar is not Odin. If he is any Norse god, he is maybe Baldr. Ulric would be a closer Odin analogue.