Boomburst is 140 power, 100% accuracy, and even has 10 PP. In a generation where there seems to have been an effort to make the game a little less powerful (Fire Blast is now 110 power, Surf is 90 power, etc), it seems really odd that they would introduce a move with 140 power and no drawbacks.
The only potential drawback I can see is that the Pokemon with access to it (Exploud, Noivern, Swellow, and Chatot) are not really all that powerful themselves. However, Exploud has decently high Special Attack, gets STAB for using it, and has the ability Scrappy so it can even hit Ghosts with it. As such, it is a real threat with this move.
So am I missing something, or is this move ridiculously overpowered?