Not to be rude, but I have no idea what your DPS looks like as a tank, nor do I know the quality of players you're playing with. You can check to see what kinda DPS I do via logs, and while I don't claim to be the best, I'm pretty apt at maximizing damage/threat as a blood DK. Unless I'm running with all range or with rogues/hunters, the melee I run with are going to pull off of me unless they literally don't do shit for a few seconds. Either the quality of the DPS you run with is sub-par, you're a literal god, or you simply have people wait several GCDs before they open.
I mean, it's not rocket science how skittish works. If they produce 2x the damage that the tank does, they will pull aggro depending on how much time elapses. I'm not saying I'm bad at skittish, I merely stated I fucking hate it. It's either a test of your DPS's patience, or the ability of your DPS to actually react fast enough to prevent their swift death (at least at higher level keys). Does tank DPS play a factor? Absolutely, but don't claim that skittish is a breeze because of our high instant AoE lol. Aside from DRW every 3 minutes, what are you going to do? Run in throw DnD down and blood boil a couple times? That's pretty much all you have. Sure you can pick bonestorm and you have the artifact weapon, but depending on the quality of your DPS, and the level of the key, you aren't going to have them up for every pack.
How are you going to keep threat from a frost DK, DH, or WW monk who can spike to 2-3 million DPS in seconds upon opening on a pack? I can pull decent DPS with DRW on mid range packs, and I can achieve pretty high DPS on giant packs too. But when a frost DK opens with pillar, and starts firing off howling blasts that crit anywhere from 1.6 to 2.3 million damage, please tell me how you consistently hold aggro? Again, not stating that skittish is
hard for me, merely stating that it's fucking annoying. It devolves into a taunt fest and praying your mongoloid DPS you brought knows how to stun or use a defensive when they know they are about to pull aggro. Necrotic isn't fun either, but I'd take it a million times over skittish. I don't know if EU has seen necrotic since the change, but the shorter duration and the instant drop out of combat makes it a far better affix to deal with.