Again, the radius of the new Storm is 15. The Diameter of the old storm that was casted in from of you was 18. You lost ONLY 3 yeards. As a user of Storm, I expected you to know how it worked. Before the patch, Storm is always cast infront of the Wiz with its AoE tangent to the caster as seen in the video below:
This means that the max Range was 18. The green semi-circle is the old Storm and the blue semi-circle is the new one. You literally only lost 3 yards!
The stun chance never mattered much since you already have Bewilder and many other CC options.
Here is an example build in old patch:
Below is the same build as above but in the new one. You can clearly see that it is much easier to use. Heck, I can survive skyfall much better now since the AoE is SO big and I don't need to wait for them to group up.
Does Storm still need a buff? Maybe. But I don't think so.
For those interested, the build in the vid only uses Hunger, Permafrost, Frozen, Elements and Cosmic Power as Sets. I am not revealing the whole build as it has bugged mechanics that negatively affect it making it harder to use than intended (Every of my builds have bad bugs for testing). It also requires a lot of skill as it uses no Dodge and Block affixes. Only 10% default Dodge and 10% Dodge from 20 Dexterity (I got very lucky at the end of the vid XD). This build relies solely on your positionning (Don't play TNT maps XD), CC (Freeze, Knockback and Bewilder for Stun) and killing power to survive. The knockback saves me a few times in the vid.