So I'm primarily a healer. A White Mage, to be exact, currently at level 33. I'm spending some time taking a break from leveling up my job while I run the three storyline dungeons collecting Alcolyte gear for when the vanity system finally shows up. I've run an average of two of those dungeons per day, every day, for a couple of weeks now... say, over thirty low-level dungeons. Maybe as many as fifty.
I'm also a regular reader of the forum here. And I've seen a culture developing of blaming tanks. There have been entire threads in the forum about how bad tanks in general are. And I have to say: poppycock.
Every one of the dungeons I've run have been pick-up groups through the duty finder. I don't mind using the duty finder, because I'm a princess... I mean, a healer. I put my duty finder request in, and within a minute or two, tops, I'm in a group. In the 30-50 dungeons I've run, I've encountered exactly one bad tank... the one who abandoned our group moments after the damage dealer characters admitted that it was their first run through that particular dungeon.
But you know what I've seen that's worse than bad tanks? People making tanks feel bad. I've seen good tanks apologizing because a mob shifted its attention for a few moments from the tank to a Thaumaturge or Arcanist. I've seen tanks bending over backward to hold agro, and saying they felt like they weren't doing a good job.
What that says to me is that people aren't just giving tanks a hard time in the fora, they're taking that attitude into the game, and giving tanks grief. And I'd like it to stop. Because this is a game, which we're playing for fun. And no one likes feeling like a failure; no one likes being yelled at when they're doing their best. Give tanks grief, and they'll stop tanking.
And I like being a princess too much to give up my short duty finder queue times.
Instead, I'd invite everyone to think about what they, personally, can do to help the tank hold agro. Healers, don't spam your highest agro-generating heal, Medicae, if only the tank is taking damage. Think about how much damage the tank is taking, and how fast, and don't over-heal. Keep her on her feet, but she doesn't have to have a full bar at all times.
Damage dealers, stay on the tank's target unless there's a good, strategy-related reason not to. (EDIT: I'm told this is a poor example. I'm a healer, not a DD, so what do I know about how Damage Dealers do thier jobs? My point is simply that there are things everyone can do to keep the agro down).
And everyone... communicate more! Tell each other what would be helpful to having a good run. The best, most rewarding dungeons I've been in were those where everyone participated in talking about how to beat the dungeon. Maybe they weren't the fastest speedruns, but they were the dungeons when I had the best time... and I've made friends out of those runs.
TL;DR: When you point at the tank, there are three fingers pointing back at you.