To me, every album up through Octavarium had elements that were new, different, and/or surprising. For what I believe are probably obvious reasons, I would also put The Astonishing into that category as well. SC and BCSL didn't have that. And that's okay--they were still solid albums.
Coming into the Mangini era, ADTOE, DT12, and DoT don't really have that "new, different, and/or surprising" element either. I would say that they all feel very "safe" in terms of the writing--not a lot that is new or different, but just DT doing what they do best, and doing it well. And that's ok. Heck, both ADTOE and DT12 are in my top 5 DT albums of all time, so I am absolutely not knocking albums being "safe"--especially so deep into the band's career. They obviously are going to have an established sound by now, and also pretty obviously aren't going to significantly deviate from it too often.
To bring this back to DoT, after having it for awhile now, it doesn't quite rise to the level of ADTOE or DT12 for me. But it is still a really good album. It shows the band continuing to do what they do well, and continuing to write new music of the highest quality. Whether or not it is groundbreaking, makes me sit up and go "oh, wow--this is different," or cracks some arbitrary "all time" list isn't really relevant to me.