Not neccessarily. The Avenger miss the boost action, so its more a jouster then a flanker.
You would of course fire 2 Flechettes at one Avenger, so it would lose its action in the comming turn.
You could go up to 26 points base cost, thus permitting 4 of those in a 100 point game, of course.
Looks like FFG son't want to spiol the E-Wings dial ... so we need to be patient.
Beyond that it's hands down way way better than the Defender at anything less than 27, and nullifies the Defender pretty hard even then, as one less shield and an Interceptor dial is certainly worth saving three points.