I love TOT, probably due to the fact that ITNOG was the first song that I heard from DT and that I am hailing from the direction of metal instead of progressive rock or something else.
That said, As I Am is really good, but not even close to being the best from TOT. ITNOG, Endless Sacrifice, Vacant and SoC all wipe the floor with it.
Petrucci's solo is mental though, probably among my Top 25 DT solos.