Most infuriating issue in ESO are the public dungeons. Why they allow 30 bots to camp a boss 24/7 I'll never know. Most of the ones I've been in I have yet to see what the boss looks like as the bots have it dead in about 1/10 of a second. When I hear the bots attack, I cast an aoe and pray that I tagged the boss before he evaporates. If you wait to actually see the boss you'll never catch a glimpse of it before it is dead.
That has turned off everyone that plays with me. I don't know if Zenimax is waiting to make a show of mass banning bots, but they are losing customers in the meantime.
Someone on the ESO forums had a good idea for this. Just have a "boss cooldown" that resets to something like an hour once you kill a specific boss. With the way they use phasing, it should be quite simple to just phase you into an instance that has that boss respawn set to 60 minutes, instead of 1 minute or so like it is now.
But yeah, it's definitely one of the most annoying things in the game right now. The other one is bots teleporting to ore/rune/etc. locations, harvesting, then teleporting away. They're invisible when doing this as well, but you can see it sometimes when one of them gets stuck, and the bot name will pop up as you approach to harvest, but you won't see the char.