Obviously this is going to come down to personal taste. Not very often does an album get recorded that even comes close to being "perfect". There are a few that in my eyes, are pretty close. In no particular order.... Here goes....
1. Appetite For Destruction. Guns & Roses
2. Operation Mindcrime. Queensryche
3. Boston
4. Pyromania. Def Leppard
5. Master Of Puppets. Metallica
6. Back In Black. AC/DC
There are probably a few more that I'm forgetting about, but this list is pretty close.