probably metallica, I consider And Justice For All to be the greatest metal/rock album of all time. They still sound great and I would totally recommend seeing them in concert if you can.
I used to like Metallica and other bands a lot, but then I grew up and my music tastes have changed. At this point Metallica can be considered "dad rock", lol.
Huh, I think their early stuff is actually objectively very good with complex compositions and interesting ideas.