My brother loaned me their back catalogue the other week and I'm pleasantly surprised, particularly by their first two albums which I'd never heard in full.
I was surprised too at how many songs on Hysteria I'd completely forgotten about. When that album was released (1987) I was heavily into thrash (Metallica, Celtic Frost and Slayer, mostly) so Def Leppard was "false metal" and too glam and girly for me to pay much attention to.
I want 2012 to be a year that I listen to a lot of very different music and expand my musical horizons a little more. This has been a good, gentle start.
I'll report back.