This was the beginning of the end of my album-by-album following of DT. What follows is my personal opinion, maybe not so logically consistent or well supported by examples.
Lyrics feel more like story outlines than actual stories. What I mean is that they feel too literal, and not set to prose or poetry for use with the music. When metaphor is used, it seems very forced and gratuitous (Out of an ivory mist/ I felt a stinging kiss/ And saw a crimson stain on her lips). I remember thinking "crimson would be used to describe something that's like blood, not actual blood." Compare to "Liquid shadows crawl/ Silver teardrops fall/ The bride subsides to her survival". I have no idea what that means, but it sounds beautiful. Or, "As far as I could tell, there's nothing more I need/ But still I ask myself, could this be everything?" Much more direct than metaphorical, but still poetic. Maybe it's all the same, and I'm just displaying a nostalgia bias for their older stuff, but I was eagerly anticipating and enjoying all their new output from SFAM to 8VM. Something just happened to me with this and their subsequent albums.
I feel similarly about the music and production/sound, but I'm a bit trapped in my head about that, and can't really explain what I'm thinking.
I've spot checked their post Octavarium albums here and there over the years as they were released, but this week I'm making a deliberate effort to listen to them front to back. I'm up to A Dramatic Turn of Events, and so far nothing has really made me want to go back and listen again. I'm eager to listen to The Astonishing, however.