Octavarium's perfect - it's the constant intensifying. It fades from silence, into ambience, into orchestra, into a soft acoustic guitar bit, into soft rock, into harder rock, into technical metal, and culminates in an agonised scream. It earns the fuck out of that ending. Bloody stellar.
So I'd say "More scattershot than Octavarium" is faint scorn. I do remember it wasn't that long ago people used to complain about how wanky The Darkest of Winters was. Misplaced ire, I felt then as now. A Change of Seasons is one of those songs I never end up listening to, though - it's probably among my least-listened DT songs. It's not like Don't Look Past Me, where you can just stick it onto the end of Images and Words, or Cover My Eyes et al. where it's part and parcel of the FII demos - it doesn't fit snugly into any era or album, so it's not something I end up groping for when I fancy putting some Dream Theater on. I might pop it on a disc with Raise the Knife, as was the original plan. Figure in a couple more FII cuts, see what comes out.