My opinions on Metropolis, pt. 2 are controversial, even to myself. See, I found it to be an entirely underwhelming album. A number of songs are fantastic on their own (namely "Regression/Overture 1928," with "Strange Deja Vu" paired in there when I'm really in the mood, "Fatal Tragedy," "The Dance of Eternity," and "Finally Free." The Budokan version of "Beyond This Life" is fantastic, and "Home" can be fun when I'm really in the mood) whereas the whole album just feels like a chore to listen to. Interestingly enough, I think I would adore the album if it was released as one long song instead of twelve tracks, or at least if various scenes weren't arbitrarily split up. (And yes, every song I did not mention happens to be one of my least-favourite Dream Theater songs.)
My opinions on Six Degrees of Inner Turbulence are quite uncontroversial, I'd say. I think it's one of the greatest albums of all time, and every song is as close to perfection as they can get. Odd how my opinions are so different for albums released directly next to each other. >.>;