Does superb damage, so it is..

almost useless when there are enemies around your target unless you are trying to interrupt flag capping or such. if its a single target tho, insane dmg.

Bang! And the stain is gone! XD

Works great for clearing low lvl mobs outta your way. Also good for boss encounters.

even good when there are 2 enemies because you can use blade flurry first

as the above say this is not sum usless crap move. very devistating dps on 1 target. blade furry does stack with killing spree. so if u get a good enof handful of enemys u can do plain insane damage with it(mainly in pve) for pvp i tried shadow dance. didnt like it>.> not sure if im just not good at it or wat. i just never found it all that usful when u can put points for blade furry or cold blood(shdowstep of cource in wotlk).

so murder spree>1 target/mob
murder spree<multi player targets

You guys are forgetting something. This skill is in combat, a raid talent tree. I think its an attempt to make combat rogues have a chance when they get ganked doing dailies or give them some burst in bg.

Well, it IS a welcome addition to any rogue´s AoE repertoir,
which does not include very many moves. Before this rogues
only had Blade Flurry as an AoE, and that´s a pity when it
comes to clearing trash out of a raid/instance. Before this
I had to just stand aside and watch while the others killed
everyone (not JUST watch, of course I was attacking one mob,
but that almost counts as standing aside and watching when the
others are killing five mobs a second).
Also a kickass move for single mobs when you´re questing.

Tip: Do NOT use it when there are other mobs around, You WILL
hit them too.

This skill is great.  does great damage for pve as well as pvp. i suggest for pvp to use this attack rotation.

CHEAPSHOT_KILLINGSPREE_KIDNEYSHOT

then just burn the rest of your oponents remaining health points down.  this attack rotation works great on classes with
low armor and/or health.

If you really wanted to go nuts with this move you would make a macro that would equip a slow off hand weapon right before using this move.

first of all, anyone wanna make/post a macro like that? :P
and also i wish this gave CPs to ur last target.. or at least have a glyph making it do so..

This so reminds me of this
http://wiki.guildwars.com/wiki/Riposting_Shadows
Description and execution is different, true, but the effect is pretty much the same.

kickass move i tried shadowdance which is OK but this is just painful and it's VERY useful since it uses no energy and its good 2 use when ur out X_X

On bosses:
ss-ss-ss-kill spr-ss-ss-ss-adren rush-blade f.-slice & d-spam ss and feint :)

This is basically a rip-off of Juggernaut's Omnislash ability in DotA: Allstars.

People who think this is useless need to look again. Drop one point on SnD, then Blade Flurry then drop Killing Spree and your dps is insane and you hit everything.....

This is an AOE attack yes it does do good damage single target but it's at its best on grps of 2 or 3 used as I said above. I can easily peak and 4K5 to 4K8 dps on small groups when used with BF.

this itself is decent, but this with BLADE FLURRY makes for a potent blast of damage. use both those at the same time when your energy is low from fan of knives, then whip out MORE FAN OF KNIVES! gives you something to do while that energy regenerates >:D

damage with this also increases by 20% next patch, good stuff. combat ftw

think this is one of the best skills for a rogue in the game im leviling mine for it :)

20% more damage and a major glyph for 45 seconds less cooldown says, I'm thinkin arby's! err i mean combat spec.

At 70 with Kara raid gear equipped (instant poisons on both weapons) this move was able to peak me at about 3k DPS no problem...at 80 you can prolly imagine the chunk of health you will take down

This is going to sound strange, but is there a mod that has the Unreal/Halo announcer shout Killing Spree every time you use this ability?

not sure how this is better than shadow dance. I can get 5 ambushes off before shadow dance drops. 4 of them DURING kidney shot.  Each one is 4-5k on casters. I'm 69 with mostly greens.  My ambush is 70+% to crit.

to match 20-25k of shadow dance, this would have to have every hit from both weapons hit for 2k-2.5k damage. Or, it would have to last 3 times as long.

so how is it better vs 1 target? 

I'll assume you NEED to be fighting a group and combining this with other skills to get use out of it.

Now if it was 10 attacks, lasting 5 seconds, that would be something.

The only problem with that, Killing Spree doesnt require much skill to use, while Shadow Dance would need your single target to stand still long enough if they somehow got away from your kidney shot. Long story short, Killing Spree is a good ability with great damage, but its probably outclassed by Shadow Dance if you have the skill.

Does an insane amount of dmg, especially if you have 2 1h swords, mace, fist weapons... But I hate it when there's mobs/players near the guy i really want to kill ;(

My question is will a weapon proc such as crusader or life draining proc from this? EDIT: Maybe even sword specialization talent?

while lvling or farming get this.
hit one mob sinister strike , slice n dice , pop evasion then blade flurry and hit the killing spree..
all dead in a matter of seconds and almost no health lost

oh dont forget to poison the blades ofcos .. its insane its like an overpowered aoe.

This is great for sorting out clothies on flying mounts who keep emoting because they think they're out of attack range. 

Fly above them, dismount, as you pass them hit Killing Spree, watch them die as your 'Safe Fall' passive lets you land comfortably on the ground. 
If your weapons aren't quite heavy enough to do that then just add 2x Deadly poison.  The caster will have to land to dispell it, which he wont want to do, so he will attempt to fly off and die 5 seconds later from the DoT damage  ;)