wow, so a 3 combo tiger strike must do massive massive damage then with that finisher huh?
Nope. Here's an example. Let's say that your 3-hit Tiger Strike adds 1500% ED (slvl 21). Let's also say that you have 150% ED from Dragon Claw (slvl 21 again), and 200% ED from your strength and dex (about 130 strength and 130 dex). Let's also say that you deal 100 average damage with each claw (~200% ED Runic Talons), have an 8-frame Tiger Strike, and a 6-frame Dragon Claw (dual Runics with 50% IAS). We'll also use a 100% chance to hit (just to make the numbers easier).
If you go Tiger/Tiger/Tiger/Dragonclaw, it will take 36 frames (8 per tiger * 3 tigers = 24 + 12 for a two-claw Dragon Claw). You will deal 300 damage from the first Tiger (base damage + 200% ED from str/dex), 300 from the second Tiger, 300 from the 3rd Tiger, and then 1850 from the first hit of Dragon Claw and 450 from the second hit of Dragon Claw. The total damage for that time is 3200 over 36 frames.
Now, let's say you just skip the Tiger and go Dragon Claw/Dragon Claw/Dragon Claw. That'll also take 36 frames. You'll deal 450 per dragon claw, and attack 6 times, which means you'll deal 2700 damage over 36 frames.
What's this? You spent 20 skill points in Tiger Strike, and it really only increased your damage-over-time by 18%? Seems like an awful waste of skill points, to me.
In fact, when you look at it even closer, Tiger Strike even loses that meager edge. First off, you will *ALWAYS* have a better chance to hit with Dragon Claw than with Tiger Strike (DC adds a ridiculous 515% AR at slvl 20. Tiger Strike only adds 148% AR). Since you'll hit more with DC/DC/DC than with Tiger/Tiger/Tiger/DC, that'll skew the damage in DC's favor. Also, since Tiger Strike attacks slower, if you whiff with TS, it actually slows down your damage output even further than if you whiff with a DC attack (whiffing with Tiger sets you back 8 frames to DC's 6 frames). Even worse, this is assuming you can get a perfect 3 charges every time- if you overcharge or undercharge Tiger Strike, the damage output over time lags even further behind. And worst of all, this is ignoring Claw Mastery entirely. Claw Mastery (or any sources of off-weapon ED, such as Fortitude or a Might Merc) will further skew the comparison in favor of Dragon Claw.
In real-world situations, you will actually deal more damage by using Dragon Claw 100% of the time than you will by using Tiger Strike. Tiger Strike is really only useful for Dragon Tail builds, since it works multiplicatively with DTail's ED% (and additively with everything else). You lose so much damage attacking with Tiger Strike even the huge bonus isn't enough to make it all back up again.