Now before the 'Stam Sorc is fine'-train leaves the station, let me say this.
Stam Sorc sustain is fine, Stam Sorc defence can be pretty strong but when's the last time you were killed by a stamsorc that didn't use Dizzy -> Onslaught -> Executioner?
Yea, exactly. In BG's with that stupid Azureblight set but
aside from that, I'd bet rarely, or never. And that's not only because there's like... five of them, it's also because Stam Sorc offence is really, really weak.
Thankfully, the way to fix Stam Sorc and make it into an actually playable class in PvP is super easy, barely an inconvenience!
Just needs two things.
Air Atronach
I mean, people have been asking for this most obvious of all obvious additions for literally years. I can only assume Zo$ doesn't know how to program it. Basically, one morph of the ultimate becomes a 25 second, stationary Storm Atro that grants major berserk synergy and does some AoE every now and then. The other is a 15 second mobile air atronach that moves and attacks with rapid attacks and whirlwinds and applies fracture or something.
This gives Stam Sorc not only a useful summon to get the Daedric Protection Passive (which the flying daggers also give you for some reason) but it's an actual stamina class ultimate that would add some pressure and a window for actual damage in between the noodle-slap fight.
Crystal Sword
The second pretty obvious one is that one morph of crystal blast becomes stamina. Every stamina ability used has a 35% chance to proc this single target, melee attack that dishes out some actual burst damage, while reducing its cost. And here's the kicker, you don't even need to delete Crystal Blast from the game for this. Just make sure that if you hard cast either of these morphs, you require more resources and a cast time but it deals some nifty but not overpowered AoE damage. Like throwing a blast of crystals or winding up a big cleave-like swing with the sword.
This also lets stamsorc benefit from blood magic - which it can't right now - and allows skilled players to actually try to set-up some decent but hard burst with this. Get 4 flying daggers with armaments, proc a crystal sword. Then fire then off after the other for some good burst. A dodge will fix it, but at least the option is there. EZ.
And that's it, that's literally all it takes. Two changes, the rest may be mediocre but it's fine. Doesn't have a spammable? Okay, whatever, not every class needs one. Can choose Flurry, Dizzying, Shield Bash and trigger the Crystal Sword for a bump in pressure. No execute? No problem, stamina has plenty of them on the weapon skill lines. Three to choose from.
So yea, hire me Zo$. Hell I'll work for free if it means some actually decent changes are made to this half class that needs to rely on proc-sets or silly kill-combo's that work better on any other class.
Wish List but probably OP...
Change Conduit so it grants +10% mag regen and lets a sorcerer use his highest damaging, crit and penetration stats when doing shock damage. That'd instantly make Overload, Fury and some other skills actually viable for Stam Sorc - if costly. Buuuut this is probably OP since even I don't think Fury is a well designed skill.

Now the 'Stam Sorc is fine'-train can leave the station. I think the 'Permafrost is fine'-train track is clear.