I'm new in here so I haven't read all the messages, but I know many people don't like Octavarium, and I really don't understand why..
I find this album great, I've already listened to it a thousand times, It's true DT has changed the style of the music, but It's not a bad thing, I think every album shows a different aspect of DT, some prefer the darkness of ToT, some prefer the softness of Falling into Infinity... Octa is a new style, It doesn't mean the band is dying, It simply means that they try to experiment new styles.
It's true I didn't like Six Degrees and ToT so much, but I really like Octavarium, at some moments It made me shudder...