For now lets ignore the pure damage output of the Sorcerer core skills, but we’ll get to that in a bit.
Ice Shards is the best designed skill sorcs have when considering the aspects that pair with it. Here’s why.
A good skill is something you can fall in love with early on and continue to use. If you were one of the people so saw ice shards early game and enjoyed using it, congrats, you rolled a 6.
Ice Shards grows as you grow. It starts to richochet. The richochet becomes more reliable as you get barriers, or you can choose from vulnerable (but of course you won’t because every sorc in existant takes frozen nova due to its insane power).
Then you get the aspect, either from drops or from the dungeon, that allows it to pierce. It grows again. It loses some damage, but the pierce + richochet makes up for it. And it looks and feels great.
Then, as I mentioned, you add in vulnerability and all the vulnerability perks. Maybe you add the Ice Shards enchantment.
This ability grows so well with you, and it’s easy to stay in love with it.
Now lets look at something light Chain Lightning.
CL is amazing low level. It’s fun, punchy, looks good, and is strong. But it quickly falls off. As pack density increases the relative damage on CL drops significantly. To be comparable to Ice Shards it would need a chance for each bounce to double, or get a free bounce, or both. But instead it gets a rare [25 - 35%] chance to chain 2 additional times. This is completely insignificant.
Back to Ice Shards, you get some amazing synergy and choice in making it spammable, namely with Avalanche. CL has no such option, and STILL costs 5 more mana for some reason.
We could do a similar analysis for every ability other than Ice Shards, and they all need a significant rework to be at this level of FUN and POWER.
Ice Shards might do a bit too much damage right now, and a small damage nerf in one form or another may be warranted, but the real fix for sorcs is to fix every other core ability so that they grow appropriately with you as you level.
Oh, also Mastery skills are awful and should be stronger and on a short cooldown.