Yes it is.
Avenger’s Shield
30 yd range
Instant 15 sec cooldown
Requires Paladin
Hurls your shield at an enemy target, dealing (75.3523% of Attack power) Holy damage, interrupting and silencing the non-Player target for 3 sec, and then jumping to 2 additional nearby enemies.
Protection
Shields you for 8 sec, absorbing 60% as much damage as it dealt.
Protection
Deals ((8.04205% of Attack power) * 1) additional damage to all enemies within 5 yds of each target hit.
Fine, it’s not a true AOE. It’s still an at-worst 1 priority/2-random target interrupt that has its cooldown reset all the time that doesn’t take the place of the 15-second single target interrupt paladin also has. Thus, far better than what brewmaster monk has.
The difference is stun versus interrupt.
There are many enemies in dungeons that are immune to stun but have casts that can and should be interrupted. Avenger’s Shield can be used on those enemies for the interrupt, even if the silence does not work.
And again, when dealing with casters, a true interrupt prevents it from immediately being recast, a stun does not. So stunning an enemy for a few seconds only to have it recast still leaves you needing to handle the recast, something you don’t have to do if you interrupt.
Then I guess we’ll ignore the fact that Leg Sweep always has a 1 minute cooldown, compared to Avenger’s Shield having a 15-second cooldown at the absolute worst, but on average much lower due to resets?
Yes, nobody is saying otherwise. But the amount of interruptible casts compared to stunnable casts is probably 100 to 1 in current dungeons.
Further, AOE stuns can come from many places, you don’t need to get that from your tank; there are only 2 multi-target interrupts in the entire game, the other has at best a 45 second cooldown, and Avenger’s shield is the only one that comes from the tank and can be reset every second if you catch some procs. Avenger’s Shield is a one of one ability that comes only from prot paladin; no other tank has anywhere in the ballpark of the same ability to interrupt.