My friends, whoever has experience of troubles, knows
That when a wave of evils come against a man,
He is likely to be afraid of everything thereafter;
But when the Spirit flows with gentle force, he trusts
The wind of lucky fortune always to blow the same.
For my part, everything has long been full of fear:
Both hostile visions from the gods have appeared to sight,
And a roaring--not a sound of healing--rings in my ears;
Such are the evils that stun and frighten me out of my wits.
This is the paradox, the mystery, of Aeschylean tragedy (we might say, of life): man loses none of his responsibility, even though God, for His part, surrenders none of His control.
from Introduction by Anthony J. Podlecki
There's more commentary and reaction between the limited number of players in this play than drama. The entirety of The Persians is the aftermath of King Xerxes's attempt to invade Greece. The scope of his hubris and of the loss to his nation is examined by the elderly chorus and his mother the Queen: They lost a generation of men, they lost their opulence, they have lost their political relevance on the world stage. We finally see a despondent, rag-wearing Xerxes in the final moments--and he can hardly articulate full sentences before lapsing into inarticulate expressions of woe alongside the chorus.
The play is rather staid, even by the standards of Greek drama, but the language and the imagery is stunning. Like The Trojan Women by Euripdes, Aeschylus's The Persians examines the aftermath of defeat. At this point in the play, there's nothing which can be done. Xerxes has chosen his action and it was thwarted by the gods; the characters cannot change anything at this point. They can only express grief and look forward to a dismal future. Xerxes's action has ramifications for families as well as for the nation as a whole. Aeschylus does a good job presenting the many levels of grief rippling through the Persian people because of Xerxes's decision to attack Athens.
While I much prefer the drama of The Oresteia (who wouldn't?), this is a good play for its poetry and imagery. Like almost all ancient Greek drama, it's definitely worth an afternoon's worth of your time.