Bekkler, Norse mythology varies quite a bit by region and era, but it is generally incorrect to say that Hel is where the dead went. There were, oddly enough, four potential places for the dead to go. Valhalla, of course, being one of the more famous. Half of the dead in a battle were dedicated to Odin in that regard. The other half, however, were sometimes said to go to Frigg/Freya. Then those who died a "straw death" (that is, died in bed of old age) might go to Thor's hall. And some people did in fact end up in Hel's halls, which weren't very nice, being constructed of snakes.
The curiosity here, however, is that the dead in Hel's halls would, at the end of the world, fight against the gods, while the dead in Valhalla would fight with the gods. The afterlife could be a punishment or reward, but it was also a waiting place.
As for Odin and the Aesir in general, they differ from the Greek/Roman gods in that a lot of their actions ties back to a general purpose (which isn't always apparent and probably wasn't always included in the original tales). That is, Ragnarok. Odin sacrificed his eye to drink from the well in order to gain knowledge, which allowed him to be one of the few people to know how the end of the world would happen. Tyr lost his right hand in order to bind Fenris, giving the gods (and mortals) time to prepare for the end (and he marked himself as untrustworthy; he lost his hand since he had lied to Fenris). Thor was double-marred; his hammer was imperfect due to the influence of Loki (and Loki was malicious, in some tales, due to the gods rejecting him), while he had a nail in his forehead, which he received in a battle against giants. The only major male god to have not been harmed in some way defending or preparing for Ragnarok was Frey, who sold his sword for a wife, yet he too would fight and die at Ragnarok.
Norse mythology wasn't exactly good vs. evil, but it was "The Home Team vs. The Visitors."
And finally, speaking of mythology, I highly recommend godchecker.om
It tends to present technically correct but humorous information regarding various pantheons, deities, and Christian Saints.