To jump in on the discussion about the Odyssey: the song is without a doubt magical and is the last thing I would call "weak". And while it may be one of my favorite songs ever, I think we should admit that many opportunities were passed up with its composition. I agree with the comment that the beginning and end are done very well. Part 1 is brilliant (ditto), and it's contrast with part 2 is compelling. However, from this point on, we are left with much of the same "jamming" until about 18 minutes into the song, where it once again assumes its bombastic character. The vast middle portions are good metal in their own right, and there are some sick solos and melodies, but they don't really go beyond what's called for like the beginning and conclusion do, which just kick your ass.
Most specifically, the song goes too long after part 2 without enough of a dynamic range to stay as compelling. And parts of the story that deserve particular treatment, such as the cyclops, hardly got a proper musical interpretation. The dangerous but captivating song of the Sirens would have been a great opportunity to do something different as well. For the Circe part, MJR plays a scale; that was some sweet shredding, but does it add anything atmospherically to the depiction of this chapter?
I don't want anybody to think I'm being critical of this song, because I'm not: I love it. The fact that SX came up with the material we do have is astounding. Just to be on-topic:
SX: Masquerade
Damnation Game: Winter's Dream
Divine Wings: The Accolade. Holy crap.
Twilight: Through the Looking Glass
V: It's sadistic to pit this album against itself. I'll reluctantly say Oracle
The Odyssey: Surprise! Accolade II
PL: The title track contains awesome material but also some baffling elements. I'll say Babylon.