A (bad ?) way of tanking...

[Degaulace]

I agree too.
And in a few situations, like AV's poisoned-floor rooms or in Dzemael (exploding crystals), I stay in movement and wait for the tank to stop moving, indicating that he finished his placement and that the battle can begin. Because running back (or moving further ahead) is needed in order to avoid being poisoned or taken in crystals explosions.
In other situations, where excessive movement for packing and placement is not needed, I admit I don't wait. As soon as the mob's name turns red (indicating that he's being targeted and attacked by the tank), I begin to cast my dots. The way the battle runs then depends on the tank's behavior : if he didn't do useless movement, everything goes well. But if he ran back (or move ahead for no reason), then one of us (me, the other dps or the healer) may take the enmity, which happens frequently in case of a tank needlessly moving around.

Depending on the POV, I may be at fault : I should follow the leadership of the tank, as you say it, Yunnie.
But we could also have it that the tank is doing junk...

If what I just explained does not apply, then maybe the tanks on your data center play differently then the ones on my data center...

I guess I encounter many low lv newbie tanks (or maybe newbie players), as many of them are not synch...it could explain this perfectible way of tanking.
As far as I remember, I didn't see many experimented tanks, so my POV is only based on lv < ~35-40 tanks.

As DPS a you have a role to play in effectiveness. Sometimes means holding off the trigger longer then you normally do.

I must say I totally disagree with that. From my POV, depending on gears and lv, a tank who tanks well will succeed in keeping the enmity on him, even if the dps are bursting like crazy.
However, I indeed restrain myself sometimes, when I see it's needed. It makes me sick, even it's only caused by the tank's poor gear (and not by his gameplay), but I DO do it.
I keep disagreeing though.

When someone told you "wait for DPS", you have answered it is not a problem I can DPS directly due to you use dots, but you are wrong.

First, when someone told me I should wait, he advised me to wait about ten seconds between the tank engaging and MY engaging. Do you realize how far this advice is stupid ? TEN SECONDS !!!! Wtf.
Second, how do you know I'm wrong ? Do you know for sure wether dot skills generates less enmity or more/equal than direct damage skills (it was one of my question) ?

And like I told you in the french forum, if a tank do a mistake you must be able to adjust your DPS and your position.

The fact is : I don't know wether this run back technique is a mistake or not.
To know it is these topics' purpose.
I consider it to be a mistake when it's not needed, but as I said, I don't really know how to play a tank. This opinion of mine is based on observation, and above all on the common sense : why take a walk around the room when mobs are alone/isolated, when there's no danger (poisonous floor, exploding crystals, for example), when the place is large enough for melee dps to be at max efficiency and when the mobs are almost perfectly packed (or when there's no need to move for them to be well-packed) ?
It was the first and fundamental sense of my questionning, and my reasons for creating these topics : to know if there was a real reason (and so adjust my gameplay), or if I would be right telling the tank he souldn't do that...