Tool is a band whose success is a total mystery to me. They're just so dull, dull, dull, dull. Did I mention they're dull?
Speaking of dull, Dream Theater just bores me to tears. Porcupine Tree as well. It seems to be more about showing your virtuosity on an instrument rather than having any sort of feeling in the music. I'd rather hear someone make a few mistakes if he shows some passion. Listening to those kind of progressive rock acts just leaves me cold.