I agree that their last three albums haven't been great. However there are some great songs on all three of those albums. It's funny that you find SC their worst because I think it's far and away their best album since Scenes. The song (technically broken up into two parts) In The Presence Of Enemies is the best song they've ever written. It encompasses everything that DT does so well. Now if they could only do that for an entire album...
I'd say Octavarium is their second best of those three with the only bad songs being 2-4. Sacrificed Sons and the title track are both amazing prog songs.
I don't know what the fuck they were thinking with Black Clouds. I remembering thinking to myself, "Man that title sounds awesome, this album is going to rule!" hoping that they would continue pumping out stuff like ITPOE, but man was I mistaken. A NightMare To Remember is a great album opener, and A Rite Of Passage is ok, but the rest of the album fucking blows, especially The Shattered Fortress. If you are reading this DT, STOP MAKING MEDLEYS OF YOUR SONGS AND PUTTING THEM ON NEW ALBUMS AS A COMPLETELY DIFFERENT SONG FFS. That song wouldn't be too bad if they actually used some of their good songs. ugh
Anyway, I rate SC a 8/10, Octavarium 6/10, and Black Clouds a 4/10.