So, Interject...mostly useless?

[Raldo]

MOSTLY useless? Yes.

Here's the list of things I've used Interject on (or rather, "Head Graze", the BRD/MCH/DNC equivalent).
1) Those frog dudes in the lv73 dungeon. Right when you aggro them, they will begin to cast a buff on one of their friends. This can be interjected, and they only ever try to use it right at the beginning.
2) One type of monster (I think the big chimera looking things?) in the lv79 dungeon. These cast... something, I forget what, that can be interjected. The effect looks like a big holy, it hurts everyone real bad, and if two of them do it at once, it'll nearly wipe the group.
3) Old stuff. I haven't done much old content since ShB hit, but I found interject mildly useful for Void Thunder 3 (last boss of Haukke Manor), and for Ram's Voice / Dragon's Voice when you're up against Chimera mobs (Rabanastre + World of Darkness ally raids), but that's nothing new.


And since the conversation moved to Arm's Length...
1) As Noitems mentioned, it's great for applying Slow to mobs during a trash pull.
2) In boss 3 of the lv75 dungeon, and boss 2 of the 77 dungeon, it's good for ignoring the knockback (though its recast isn't fast enough to spend it on every knockback).