Barghests are major missile magnets Gloucester, it's part of the reason I don't fly mine often anymore. Stick behind it and spam Q and there's nothing it can do.
Interestingly enough, the letter Q in french means 'ass'. So every time you run into a missile spammer, just remember that each time he sends a volley of missiles your way, all he's really doing is tapping ass.
The explosive damage we have now is no where near as bad as it was in 4.84. Two hits from a Cannonball and my Greyhound lost one or two guns and was forced to retreat.