The popularity of the poem is largely a result of the simplicity of its symbolism.
~ Master Plots II
The theme of the poem is the whimsical, accidental nature of the formative decision.
~ Mr. Yvor Winters
"The Road Not Taken" is a tricky poem, very tricky.
~ Robert Frost
There is much of Frost in the whole poem, including this apparent inconsistency.
~ The Explicator Cyclopedia