I have Valla, Illidan, Nova and Zeratul all above level 10.
I can't disagree more with you Kostadin. CatFriend is right in the assessment of threats.

Any "at least average" Nova or Zeratul player will blow poor Valla to bits before she can use 1 spell, so it doesn't matter, if you go "Q build" or not. Spell Shield helps, but it is not enough in many cases. Only way to survive is a keen eye for the shimmers of the stealths and perfect positioning.

Rain of Vengeance has a delay before it hits, so Illidan can dodge it. If you manage to put the skillshot on him in the first place, which is not easy with him jumping all over the place. And all that is irrelevant if he takes The Hunt, in witch case Valla is dead before she can even cast it.

As for Raynor VS Valla. The outcome greatly depends on build, skill and execution. Valla has more mobility. Also stronger stun (if she takes Rain of Vengeance), and more powerful self-sustain (If she takes Tempered by Discipline). Raynor has longer range, push-back, and powerful self-sustain of his own. Depending on heroic he also has more DPS if the heroic hits Valla for prolonged period of time.

CatFriend: Really good start on your guide. I hope to see this kept up to date. I think no one else included build with Punishment. I am glad to see you did, it is a really cool way to poke enemies, snipe someone and then just run away :)