Well, Train of Thought gets a lot of unwarranted criticism, considering its a pretty great album.
I think Systematic Chaos deserves a good deal of its criticism; there are really only a few songs on SC that I think of being near the top of DT's songs.
Also, WDADU and FII get plenty of criticism as well, but there are also those who stick up for it, which balances it out a bit. I don't see very many adamant supporters of Systematic Chaos.