Meh, just because something Firsttime said, made me do some math.
Level 3 Skarner can have at max rank 2 W for 17% bonus. So lets calculate his move speed.
Skarner has a movement speed base of 320. Boots 1 add 50 move which flat are applied first.
With boots skarner is at 370 movement speed. Most junglers for 21/0/9 route with skarner. Some take the movement talent and some take the mana ones. Those that take the movement don't do more than 2 points so 1% extra movement speed.
So when skarner activates his rank 2 W ability he will gain 18% on top of 370.
370 x 1.18 = 436.6 movespeed.
However any value over 415 has a softcap applied to it. Which means any raw score points over 415 will be reduced by 20%. The raw points over are
436.6 - 415 - 21.6 raw points x .8 = 17.28 adjust score
415 + 17.28 adjusted score = 432.28 actual movement speed for a level 3 skarner with 1% movespeed talent and no movespeed runes.
Decent movespeed for sure to have at level 3 which is why he clears the jungle so insanely fast. Only Shyvana is faster really. While that high a movespeed is nice over long distances, over a short distance to catch someone it may not allow you to catch someone in time. A target foe with a base movement speed of 320ish (most common), no boots, and no escape ability is still going to make it back to tower range safely from the middle of the lane before either a skarner or an even faster shyvana can catch them when coming from the river in a race.
However, if the target is pushed up some and away from his tower a significant distance then skarner/shyvana will easily catch their prey before they make it back to the safety of the tower.
1. Movespeed quints
2. Yes Q has to hit twice (you mentioned this earlier) but you are ignoring his passive when you mention the 3 second cooldown.
3. Learn to orbwalk as you attack, applying 2 q is easy if they don't flash.
4. Most Skarner's go 0-21-9 not 21-0-9 check TheOddOnes guide on solomid.
Edit: Skarner is godly even pre-6