Opiate was garbage and Undertow was extremely horribly mastered, almost completely ruined a great album. Aenima and Lateralus were fucking amazing and I'm not sure why you don't like 10,000 Days, but that's on you.
Not quite sure the love for Opiate or Undertow, honestly... Absolutely in love with Tool, but haven't ever been a huge fan of Opiate at all, and Undertow I owned, but it wasn't until Aenima when I was like holy shit, Tool might be better than NIN, and then Lateralus cracked my fucking head open.