Here is my provisional favorite-metal-albums-of-all-time-list! Enjoy!
The first 10 albums are in pretty accurate order. However, after that, it becomes harder and harder to separate the albums clearly. Thus, you can say that I enjoy album x on the list as much as the others in the interval of (x-5) to (x+5). For example album 37 would be as much enjoyed as 32, 33, 34, ..., 42, or something like that.
I guess you can see my roots in metal, with the many melodic death albums on the list. Also, my favorite genre of late is atmospheric sludge/doom.