I think the agende of ZOS and my priority list to call a game playable differs too much:
1) Fixing quests vs fixing other stuff - namely character skills. Last two patches list of fixes were about issues I never heard about. Granted I'm not an official source when it's about bugs, but I think as a player and an avid forum reader I meet the main issues. Now compare these with me having a vampire NB main. Yeah, a grand total of 20% of my class/world skills actually work. This takes out a lot from the game's 'play however you want' for the favor of fixing quests which never were bugged for me in the first place. Or fixing WW run speed (saw a grand total of 3 people with it in 3 months, I don't think they were annoyed by it btw) instead of, I don't know vampire passives maybe?
2) Bots. I thought I'm not someone who gets annoyed easily. Currently I meet more bots than regular players. The train of them idiots, the hacking and constant spamming take away my will to play. I reported them, I swear I did. None of those characters were deleted. I repeat this - my long-long list of ignore on which the bots go has those accounts on it I reported at day 1.
3) Attachment to the game. The game is really good, and I mean it. I found the story interesting and I like the veteran system. However current guild system and the lack of AH doesn't really help to make the players a community. I change guilds more than I change my armor lately - I have lots of high level goods to sell (one of those all-crafting toons) and the buyers are spread too thin. With this in mind I should also look for a proper guild, but seriously, I can't be arsed for it anymore.
Of these however the bot issue is the worst. I thought I can outlevel them and play in peace. I was wrong. The game is infested with bots, I hope they will pay enough to make up for me leaving.