Falling Into Infinity is hands-down the best-sounding DT album. Shirley did an amazing job on the mix.
It has some of DT's best material (Lines In The Sand, Trial of Tears, Hell's Kitchen), but also some of it worst dreck (Just Let Me Breathe, Burning My Soul, You Not Me) and some average-at-best pseudo-pop (Hollow Years, Take Away My Pain), along with a handful of decent-to-pretty good songs (New Millenium, Peruvian Skies, Anna Lee). The quality level is just too uneven for me rank it as one of their best.
Not to mention that gems like Raise The Knife and Speak To Me (among others) were left off.