Assuming you are talking about real physical dice and not an imaginary function that generates perfectly random die rolls.
They are actually pretty poor random number generators. For starters, dice are chaotic, not random, the outcome is based entirely on initial conditions. For humans rolling dice, the space of initial conditions can become surprisingly constrained, especially if the human wants to achieve specific outcomes.
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Assuming you are talking about real physical dice and not an imaginary function that generates perfectly random die rolls.
They are actually pretty poor random number generators. For starters, dice are chaotic, not random, the outcome is based entirely on initial conditions. For humans rolling dice, the space of initial conditions can become surprisingly constrained, especially if the human wants to achieve specific outcomes.