Is Satan evil?

[Cinjin]

According to Drich, god is good because god itself claims to be good (Am I right, Drich?).
Anything that goes against the goodness of god is evil.
According to the story, Satan did go against the will of god and has since been considered evil.
Period. End of story.

Take a step back and realize that (almost) all religions have a the god as good and some evil force as the bad guy.
Yin and Yang.
Luke and Vader. (is star wars an official religion yet?)
Sun and moon.
etc...

Something to consider though:

The dark side still often has some good in it and a story to be heard. The vicious lion that kills the unsuspecting gazelle is trying to feed it's young, but still it gets judged for the attack.

Even the moon provides light and comfort on many nights. Vader did much good and even died doing an act of valor and self-sacrifice.
The truth is, Satan/the Devil/Lucifer is just a label we give to our occasional impulses and even then, it's only the morality of our various societies that decide who those impulses will be attributed to.