Well you said it right there. You're expectations were effing astronomical. Correct me if I'm wrong but you couldn't possibly have had such high expectations the first time you heard Rage or Soundgarden. Even if you expected them to be amazing, with Audioslave you already know EXACTLY what you WANT, so no matter how it deviates from that, it loses. In my humble opinion, Audisolave is just a u-turn direction for the artists as far as sound goes, and I'd equate it to Mad Season since I never in a million years expected that album to be so extremely low-key, soft and classic rock-ish. Just my 2 cents though.