I enjoy this genre very much.
It has kind of taught me to live life as an individual as someone separate from the rest of mankind because of my rationality and scepticism.
Many artists also emphasize nature and the power of the forests and mountains. Extreme and powerful weather like blizzards.
On the one hand you have your bands that sound a bit punkish (I know I can get a bit of hate for this) like Carpathian Forest, Mayhem, and some of Gorgoroth. It has a very tongue and cheek and blasphemous portrayal of Christianity and society.
Then you have the artists like Emperor and Satyricon which kind of approach the genre as a high art almost.