My magblade usually plays in CP. Today I ventured into no CP, as I do occasionally. No issues with sustain, since my build is pretty well sorted with only slight adjustments.
My build is a burst build that does not rely on DOTs nor procs. What I noticed, again, was that procs overperform. I first had a protracted, enjoyable duel with a CP910 sorc, which I won (I am CP876 fwiw). I then faced two nightblades, one mag, one stam. The magblade used Skoria. In CP, while strong, I am not too fussed by that set, but here it was devastating. It hit for 4.5K, the same as the (non-crit) Assassin's Scourge from the other nightblade. When Skoria hits for a comparable amount, there is something seriously wrong, in my opinion. The stamblade used all manner of procs and poisons, including bleeds, lingering poisons, Viper, and the Infused Oblivion damage enchant, which all procd simultaneously on me. I lost both of those fights rather quickly.
My build originates in CP. I use shields, which are known to be less effective in no CP, although they were fine against the sorcs I faced (there were two, actually). It's clear that my build is simply not adjusted for no CP, that I should probably get Skoria in a hurry, and change the philosophy of how my build was put together. That sucks. As far as I can tell no CP is just different.
ZOS, please make up your mind whether you want us to PvP with CP, or without CP. I meet people from both camps, and from all I can gather they simply like playing what they're used to and what they have built towards. It took me months to fine tune my build. I am not going to do the same for no CP.
This would be fine, I guess, if you could choose what mode you want to play in, but there is Battlegrounds. First only no CP, for God knows what reason, ZOS are about to make them only CP enabled. With things standing as they are, both choices are equally stupid. As long as you have no CP campaigns, you should also provide no CP Battlegrounds and no CP duels in addition to the CP options. Just my opinion.
PC EU (EP): Magicka NB (main), Stamina NB, Stamina DK, Stamina Sorcerer, Magicka Warden, Magicka Templar, Stamina Templar
PC NA (EP): Magicka NB