Originally Posted by
Archimtiros
To be fair you can play Fury on Iron Maidens just fine, and it can even be (controversially) as good/better, depending on your strategy. Most notably, if you are doing ship duty, most players like Fury better than Arms for obvious reasons. Since you asked about Arms though;
Sweeping Strikes uptime is very important, but it isn't subject to randomness like Enrage because it isn't a proc. As long as you don't run out of Rage and you use the ability on cooldown, you can keep 100% uptime on it.
It's cleave is rather simple, a portion of the damage of any attack is duplicated onto a single nearby target. Notice the underlines for emphasis, it doesn't copy the actual attack. For example, if you use Execute, you aren't hitting the cleaved target with another Execute; Sweeping Strikes deals the damage after calculating a percentage of the initial hit.
This is important for AoE attacks such as Whirlwind, because only the damage is duplicated, not the attack. Sweeping Strikes doesn't cause you to Whirlwind again, it just takes the damage from one hit, calculates the percentage and applies that damage to the closest nearby target.
In practice this means you Whirlwind the three Maidens, and Sweeping Strikes will hit one of them for 50% of the damage of the initial Whirlwind hit.
On use trinket is still powerful because you can line it up with other procs, Bloodbath, Potion, CS, etc.