Pope is undoubtedly monotonous.

Except in one or two lyrics, such as the Ode on St.Cecilia's Day, which must be reckoned amongst his utter failures, he invariably employed the same metre.

The discontinuity of his style, and the strict rules which he adopted, tend to disintegrate his poems.

They are a series of brilliant passages, often of brilliant couplets, stuck together in a conglomerate; and as the inferior connecting matter decays, the interstices open and allow the whole to fall into ruin.

To read a series of such couplets, each complete in itself, and each so constructed as to allow of a very small variety of form, is naturally to receive an impression of monotony.
Pope's antitheses fall into a few common forms, which are repeated over and over again, and seem copy to each other.