Yes slam resets your swing timer but thats not my point.
If your swing timer is 3.6 (no flurry) you get a ~6.5 seconds dps cycle like this.
White 0 seconds
Slam .5 seconds
White 4.1 seconds
Slam 4.6 seconds
Nothing 6.5 seconds
But if you have lots of excess rage with slow swing timer you could go
White 0 seconds
Slam .5 seconds (during global cooldown you realize you have tons of rage)
Slam 2 seconds
Slam 3.5 seconds
Slam 5 seconds
Slam 6.5 seconds
That a 2 more slam's worth of dmg in your ~6.5 second dps cycle.
With 5/5 flurry though with a 3.6 speed weapon (assuming flurry is procced) your speed is 2.7
White 0 seconds
Slam .5 seconds
White 3.2 seconds
Slam 3.7 seconds
White 6.4 seconds
Slam 6.9 seconds
You end up with roughly the same dmg output as slam spam save you still have excess rage to use on other abilities.
So like I said slam spam only robs you of dmg if your swing timer is very quick, aka 5/5 flurry. My mind was still thinking raid dps cycles where you don't get 5/5 flurry.
Editted to correct stupid mistake.
Edited, May 9th 2008 1:41pm by Jimpadan