Ok, I think I've gathered up the courage to post my list. To keep some balance, I'm making sure to include both positive and negative opinions. I see I'm not the only person to arrange it this way.
Disclaimer - Obviously these are just my opinions, but it's easier to write it this way, and it's what everyone else is doing anyway.
CONTROVERSIALLY NEGATIVEWDADU is so amateurish and poorly written that I don't count it as a real DT album.
ADTOE is near the bottom of DT's discography, and has the worst mix/production of any DT album besides WDADU.
The last half hour of Awake drags the album down to one of DT's weakest, and Scarred is DT's worst song since WDADU (yep, worse than Lie, YNM, BMS, TAMP, JLMB, IWBY, NE etc)
LTL is the weakest song on IaW, due to its weak vocal melodies and phrasing. (Aside from those flaws, it is otherwise a great song)
I'm going to use the word weak again just to see if anybody's paying attention.
ACOS is overrated (but still a decent song), and Octavarium is the
far superior epic, and much more musically cohesive.
OIALT is ruined by DS's poor playing and JLB's voice during that era (but both have managed to improve to excellent in more recent times

)
Kevin Moore was an average lyricist, and no better than anyone else in the band.
CONTROVERSIALLY POSITIVESC is a great album (even though I don't consider it one of DT's best by any means), and hugely underrated.
TDEN is a top 20 DT song, and has one of DT's best instrumental sections.
IAW's production is awesome,
including the '80s triggered snare. ESPECIALLY the triggered snare!
FII is one of DT's best albums (4th for me just behind SDOIT/SFAM/IaW).
MP's harmonies (along with JP's) are one of the best features of modern DT albums that is sorely lacking on ADTOE (bring back more JP backing vocals dangit! And maybe JR too. This would be swell.)
A lot of DT's straight ahead metal songs like As I Am, TROAE, and CM, are top tier DT songs.
SDOIT is DT's best album in every regard, and the title track is a masterpiece, and DT's best long song.
TGP is a top 5 DT song (I rank it 1 or 2, but I'll be lenient and allow up to top 5 before I rage at you

). I probably wouldn't have added this one if there weren't so many non-believers in this thread.
Vacant is DT's most emotional ballad.
Deal with it!