Can we start a specific skill discussion thread?

[Kevin]

I've found quite a few instances where Mass Confusion doesn't work; possibly the worst offender I met was a Unique Mortar/Horde dervish with Mortar minions. It specifically cited "Immune" whenever I attempted to use it on that pack.

Shielded champs/uniques can also be immune to MC when they're shielded as well, no such restriction applies for Horrify.

I've seen immune with horrify when the shields are up. I also think you are right in that the duplicates that horde creates are immune, but the "originals" aren't.

Though again my argument was mainly from a multiplayer stand point as I mentioned, and a lot of it had to do with the rune for making the mobs take extra damage. In single player horrify is more reliable as an "oh crap" button. Mass Confusion is a not an oh crap button, it's a preemptive button, you move up to the pack, cast it, then fall back and hit them with your AoE/whatever. Horrify can be used offensively as well, but I think of it more as a defensive skill and Mass Confuse as and offensive skill.

In multiplayer I don't tend to need as many defensive skills because I simply won't have the attention of as many mobs, this makes confusion more valuable in those situations for me.

Yes, when I was soling a lot I too would often drop Mass Confusion for Horrify as well, but the idea that confusion is a poor mans horrify makes me think that you aren't using mass confusion in as many ways as you can. Certainly if you only want it for "oh crap" or defensive purpose then yes it's clearly worse. But it provides offense that horrify can't even dream of.