So, Interject...mostly useless?

[Giubba]

I admit, I thought interject was going to have more play than what i'm currently finding.

I feel its mostly useless at this stage in the game (though future raids pending of course) for these three reasons:

1. I'm struggling to think of a boss that has a move that can be interjected
2. Most mobs that have a move that can be interjected can also be stunned to the same effect of canceling the move.
3. A good amount of trash mobs that have a move that can be interjected have such a fast cast time that it's almost impossible to catch the spell to interject it (example, the fire doom walls in the Hell's Lid).

What do you all think?

Not mostly, it is useless.
Thrash mobs pulls pass usually unnoticed and in the only chance where stopping an attack would make difference (boss battles) the attacks are all unblockable. Also as other people pointed out the ability overlap with stun