At your level openings, and opening lines that are considered "busted" dont matter. But to answer your question, no its not busted.
Philidor Defence?

It's sound, but cramped and defensive, without much chance of dynamic, counterattacking chances (unlike say the Sicilian or Ruy Lopez), which is why better players tend to avoid it.
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(p. 114)
PHILIDOR'S DEFENCE
(1 P-K4, P-K4; 2 N-KB3, P-Q3)
PHILIDOR never played Philidor's Defence! Nimzowitsch (of all people)
found it too eccentric! And Alekhine got the worst of matters more
than once when he played it!
Nowadays this defence is adopted only to
avoid the better known variations of other
openings, and it has given way in popularity to
its counterpart, Pirc's Defence (1 P-K4, P-
Q3). By locking in his King's Bishop, Black can
only hope for equality. He must be constantly
on the alert for combinations aimed at his weak
King's Bishop's pawn. With mechanical moves
White can achieve a lasting advantage in space
and mobility. Black's game, while sometimes
solid, is always cramped.
After 3 P-Q4, Black's best is N-KB3, developing a piece and
attacking the rival King's pawn (cols. 1-2). Possibly White does best
to maintain the tension with 4 N-B3, though 4 PxP leads to a sharp,
open game more to the taste of an attacking player.
Evans, Larry, and Walter Korn. 1965. Modern Chess Openings, 10th Edition. New York: Pitman Publishing Corporation.
I keep encountering this opening when playing against Black. So far, I seem to do pretty well against it. I read somewhere that this opening is not much played by strong players.
So my question is: is this opening basically busted?