Talent aside, the Cavs are mental midgets in the postseason. Mitchell, Garland, Mobley, and Allen are just soft and lack any mental toughness, and that's why they're going home early for the 3rd straight year.
Also, as much as people rave about Kenny Atkinson, there's a reason he was riding the bench as an assistant for many years; as a head coach, he's kinda soft, too, and made some bonehead choices throughout this series.