For sure, later day Def Leppard isn’t “metal” in any sense of the word. But their first 3 albums shaped and influenced a lot of hard rock (and metal) that came after. Of course, all of that changed with album #4 (and quite awesome for them, but after that point the band was no longer “dangerous”).
Forever shall I love the drum fill at 1:24 in “Photograph”. It only lasts a second, but it sounds awesome.