Add/Subtract/Debate/Love/Hate
All these I see are the biggest issues, currently.
One Tamriel:
Quality of life upgrade, big content addition, for PvE. This update, after years of settling, has destroyed the foundation of Cyrodiil. The three banner war is now a free for all with zero loyalty to an alliance. Thus, has disincentivized the goal of winning a campaign for YOUR alliance. It’s the largest problem with Cyrodiil and no one talks about it.
Hybridization:
Really don’t know why this was added, it was the start of losing character identities, and it was the start of many many balance issues and the original “hit” put out on theorycrafting.
Subclassing:
Neat idea with terrible implementation and even worse consequences. This changed the game about as much as One Tamriel, solo PvErs have more freedom but it killed the foundation of ESO’s classes and combat. Not going to beat a dead horse here but will say this is/will kill ESO if it’s not looked at.
Scribing:
Overall a decent update, added variety to certain playstyles however has several overtuned scripts or skills while has several others that are mostly useless. Combined with Subclassing/Hybridization there are certain skills that are far far above anything else the game has to offer as far as opportunity cost goes.
Healing:
Specifically in PvP healing is way overtuned. Cross healing CANNOT go away, it would kill gameplay for people outside of groups, which is the majority of Cyrodiil. However, healing in general needs nerfed.
Access to Majors/Minors:
It’s too easy, these are given away with no trade off most the time. Just going to point out a skill that everyone loves because from a balance standpoint it’s way overpowered and thats why people love it and defend it. HURRICANE, best example of giving away majors/minors for free. HURRICANE is what, a buff bar skill that gives resolve, like say Volatile Armor? Nope, it’s a damage skill that lasts 20s and gives away resolve/expedition. This is one of many, especially with scribing, that need to be looked at. Skills that give majors shouldn’t be three headed monsters.
Armor/Sets:
Hybridization changed all of this, it’s a complete disorganized mess, there are so many dead sets and a handful of good sets. There’s minimal value in certain stats (health recov, max stam, etc) because hybridization allows 30+ attribute points into health. Night Mothers used to be a decent set, but now anyone can run Deep Fissure or Ele Sus even though their spammable is physical damage. HA passives are upsettingly bad.
There’s more but my boss just gave me a weird look.                 
                              "IMO"
Aldmeri Dominion
Bosmer Nightblade AR 32  -  Altmer Templar AR 26  -  Dunmer Dragonknight AR 18  -  Altmer Sorcerer AR 20  -  Khajiit Dragonknight AR 18
(+3 not worth mentioning, yet)