Tanking trash needs dps to understand game mechanics. You can't tank decent with stupid dps.
Last night I was one of 3 tanks in Naxx 25. The trash tanking in Deathknight Wing can be hard. We did it over and over again after resetting the instance several times when we were failing on Razuvious trying for immortal. (Only to find someone dying on the boss right after that.)
Anyway the packs in there are pretty hard and consist of 5 or more and you often get 2 groups. The raidleader said our tanking sucked. And yes indeed the trash was all over the place. Though I really don't think it was because of bad tanking. It was because of bad dps.
Some examples.
- A dps gets agro. He starts running away. RUN TO THE TANK!? What are these people who don't know to stay in range of the tanks?
- Tanks start out on a group. Charge in and swipe. There are 3 tanks so we all 3 want to get those trash together so all our aoe hits all targets, and others can aoe all at once. We are often not given time to do this and while moving there is already hard aoe and dps on mobs. You loose agro and you have to chase them.
- A rogue wanted to have some fun and gets agro on a mob. You taunt it and want to drag it into the pack. Instead the rogue stuns it... dps on the mob still continues, meaning you have to go back to the mob, do dps and hope you got to do enough threat when the mob gets out of the stun.
Anyway... the next and last example is in my opinion something hard to forgive. The arrogance is so huge and it shows a total lack of knowledge of the game mechanics. Again we are tanking trash. There is aoe damage. Normally swipe can do more threat then any aoe dps can so that is no problem. The only preblem is there when someone does single target dps. In this case a hunter. There are 3 tanks, and 6 mobs. Not all mobs are targetted by the tanks. Sure the tanks can switch between them, but it is really hard to do it correctly (not without marks anyway). So for tanks (at least for) tanking trash is having 1 main target you mangle and maul and the rest you swipe. Call them main target and off-target. next to that I constantly watch for some mob to break out of the pack so I can taunt it.
To continue on the example. The hunter had chosen a target that was an off-target for all 3 tanks and was not being tanked by anyone directly. This mob then ran towards him and I taunted it. It turned, came back to me, but when he was close the taunt had stopped working and the mob ran back towards the hunter. The thing was, all this time the hunter had targeted this mob and had not stopped dps. If this player had been decent he would have done any of the following (decreasing in most appropriate thing to do, nr 1 being the best imo):
- before gaining initial agro, he would have seen himself high on the threatlist and switched to a different target. /target tank /assist. Very simple;
- before gaining initial agro, seen himself high on the threatlist and he could have done Feign Death;
- when the mob was running towards him he could have done a Feign Death;
- when the mob was taunted by me he could have changed his target.
Anyway, to finish my story, if you have dps that doesn't allow you to tank you have to switch your target to the mob running away. You get that mob but that means you can't get threat on other mobs. So they break loose and you have to taunt those, with taunt being on cooldown. It is a cascading effect, that makes it seem you are sucking at tanking. Instead the dps that overagros should wake up and realise they might be doing something wrong...