Less good *music* than other bands.
And what I mean by that is simply that they're not my favorite band, not that I hate them.
The only possible interpretation of that exchange, taken literally, is that Dream Theater is your least favorite band. Since no album is perfect, "especially" not Dream Theater albums, that must mean that Dream Theater albums are the most imperfect of all albums. It would then follow that Dream Theater is your least favorite band.
Also regarding this: For me Dream Theater's strength is in their individual songs, not in albums seen as a whole. So if you compare DT's albums to other bands, they're oftenly not as strong. Maybe "especially DT's albums" was putting it a bit strong, but that's how I feel.
Still not hating here. Six Degrees is an awesome album, and so are some of the others. The rest of them doesn't quite reach awesome for me but remain at either "okay" or "good".