So... As per the title,
The sets
Sorc gets a delayed proc set that's another summon (because screens aren't crowded enough with sorc summons already apparently) that's weaker than most other proc sets already in the game. On top of this, the monoliths do nothing when there's only 1 of them up, since they deal their damage via the link beam (at the rate of once per 2 seconds, so it's not even a unique tick rate or something) oh and for the skill lines DoTs to proc this set, its on the initial hit or
5th tick only so to proc this set from using a DoT (hurricane, which will be for 80%+ of the fight) it takes a full 5 seconds before the set does anything at all or 2 seconds if you use hurricane + lightning flood...
DK gets a single set that grants
BOTH major AND minor heroism OR a unique stacking 14% healing + shielding done by casting their already broken corrosive armor ultimate, or casting their commonly used fossilize or ash cloud abilities. This is absurdly broken, DK was abusing this double heroism with oakensoul to no end and you bring it back in a single set?
NB gets a unique damage and healing buff of their siphoning skills of up to 34% for their siphoning skills which includes, burst heal, bomb ultimate, single target sticky DoT and their sustain (which is also a HoT). Great for those who wanted swallow soul buffed I guess, horrible for overall game balance though...
Necromancer gets a way to make their corpse generation more mobile and some additional buffs made available (finally), just wish it had a shorter cooldown or separate cooldowns per corpse consuming ability to allow for double tethers or tether + another or something.
Warden gets improved healing and tanking capabilities (not that it really needed these), but it fits the lines theme
Plar gets an interesting option for additional (mobile) sustain and damage (although that downside looks very harsh)
Arcanist gets even more support options to buff allies with, not that it needed more group support options.
Ratings:
Sorc: D- tier set, does nothing to help the class function as a class instead of as a proc carrier or HA build, not even sure why this set was made, it's worse than most existing proc sets, especially if ZOS does their "sorc balance" parse on it and makes it so that the beams cannot stack their damage (which is looking like they have already done based on the sets description).
DK: S+ tier set, F tier idea, this is completely broken, DK is the one class that should not have easy access to both major and minor heroism, nothing else to say for this. Expect the return of perma corrosive DKs that were everywhere in the oakensoul patch unless this set is completely redesigned from scratch.
NB: A+ to S tier set, This is is going to give NB far too much healing in PvP for what is supposed to be an evasive burst class with paper defenses while also buffing their bomb builds (tether) and giving the class a strong DoT with immobilize pressure to go with its already overtuned burst capabilities. PvE NB didn't need this set and this just further buffs PvP NB.
Necro: S tier idea, A- tier implementation. The idea behind this set is amazing, it does so much to fix the issue of abilities like tethers and the mechanics of corpses which in turn gives better use of cros DoT passive. It could use a shorter cooldown (or make it so the cooldown is unique to each ability instead of shared across all corpse consuming abilities) to allow for more flexible usage of the set.
Warden: B+ tier set, it's a strong set, provides additional buffs for tanking and healing, but not really what warden needed.
Plar: A tier idea, B tier implementation, the idea is very interesting and on the right track, giving the class some needed damage and mobile sustain, but the inevitable downside of losing half of your max magicka when the max stacks wears off is going to be rough.
Arcanist: A tier set, I don't think arcanist needed more support capabilities, but its not exactly a bad set either granting some nice group buffs.
Please ZOS, just go back to the drawing board for the DK, Sorc and NB sets, they need a complete redesign from the ground up. The rest of the sets seem like they will be fine after a few tweaks as their base ideas are definitely solid for the skill lines they support even if they aren't exactly what the classes need, but the sets for DK and NB are going to create huge balance issues and the sorc set is yet another useless proc set designed around the sorcs lightning theme (anyone remember storm-cursed?)