4.0 - Def Leppard experienced considerable backlash along with most hair metal/arena rock acts that preceded grunge rock. However, I think DL was unfairly lumped in with a slew of lesser bands like Ratt and Stryper. It's clear that their output transcended their milieu and I'm happy to still hear "Pour Some Sugar On Me" played frequently on the radio. I like all the elements on this record, particularly the intricate guitar work that help elevate songs like "Photograph", another radio mainstay from their catalog. There are also big, glam-y choruses throughout (e.g. "Too Late For Love") that make this record so listenable and catchy.