1. Rogue dl wep vs anc wyrm
Once you're on heroic haste, the difference of "over half a second" drops to closer to a fourth of a second.
Also, dl dagger loses attack and damage compared to anc wyrm, as it lacks the 500 ability, but does have 350 attack.
So once on heroic haste the only things going for it are the proc, and the tiny bit of speed. Yes, dl is better. By no means does it blow anc wyrm out of the water.
2. That mage proc is off of wand that I bet is not maxed, and even at max he'd have low attack. Five times is pretty good for a mage proc in a fight I'd say.
3. Offhands don't make a whole lot of sense for the majority, but don't druids get a chaos ward that affects everyone near them, not just group? Seems useful af to me. Mages have an aoe dmg spell but wep not that important anyways. Warriors good for a tank or two because of the cloak effect, beyond that it doesn't make sense at all. Rangers . . . I don't know the skill they get, admittedly. However, since someone just stated the mainhand for rangers are a massive upgrade, based on that alone I'd say offhand should definitely not be a priority. Rogues, the dot is good for sure, but it seems to me that the mainhand/bp (potentially last of set) it is sorta replacing would be way more useful. Not to mention the loss of regen. And even then, only one or two rogues per boss should use, more than that seems redundant, since the dot doesn't stack.
Just thought I'd join in the conversation.

By the way this was typed on my phone and I cba to correct anything I may have mis-worded etc., so I apologize for that ahead of time.