No, Hades is not dead. It was explained at the beginning that a god cannot be killed because they are immortal. Hades was punched into the River of Death by Hercules, and was flushed down by the spirits of the dead. Fast-forward after the end credits are over, Hades monologues about not being listened to feeling he is in hyperspace.
I basically placed my review on my Member Q&A thread, though I take back what I said about the music because it grew on me since I wrote this:
[quote="
TheLionPrince"]I thought the animation style inspired by Gerald Scarfe was unique and set itself quite independent from other Disney movies. The storyline was a so-so reworking of the much darker Heraclean mythology story, but still epic in tone. I quite liked the characters, though Meg sticks out to me more because she's not the usual damsel-in-distress, and I loved her sarcastic attitude. Hades was a great break away from the usual Disney villains, and James Woods stole the show, if you ask me. Alan Menken does no wrong with the songs in this movies, and "Go the Distance" is one of my all-time favorites, though I wished they kind of wished Greek music instead of gospel, but it's Menken. On a final note, I didn't like the abundant pop culture references, and I think it will age the film negatively in a few decades.[/quote]
Anyway, I look forward to purchasing the movie on Blu-Ray this summer, and hope there's some interesting bonus features.