I made a hammer character that utilizes this quite well. I noded to get 2 additional hammers, and each hammer crits for about 2k, and I toss them about 3 times a second. This is at level 51.
You need high damage to stun mobs at high levels, so get as much increased stun as you can get passively. Get the chance to throw hammers on hit too, as that will increase your damage