If You Were a Casual Gamer...

[Bob the Beholder]

If a paladin not useing the hate seal was pulling aggro he was, quite simply, not doing his job. 

Although there is a school of thought that the MA target should be largely ignored by a warrior in order to secure the other targets because the first MA target will typically go down VERY fast. 

This is generally waht I push with my warrior, as pickup groups are often not patient enough to wait for me to secure aggro on all mobs.

I can't speak for the lvl 60 instances, but for the lower instances, gear is important, but not critical.  These are the same instances where a casual gamer will spend their time.  How much post 60 time will a casual gamer have.  I was able to hold aggro very well in Blackfathom and SFK using a level 20 green dagger and a quest reward shield.  Gear helps your healer, but aggro generation is all about rage and talent build, which doesn't get a huge boost from damage in critical instance scenarios.  Agility gives a small improvement to getting revenge to light up, but not a huge one.

I'm curious as to HOW gear really helps a warrior in an instance.  Solo it can change things quite a bit, but soloing is pretty easy anyway, especially with a casual gamer getting a nice rested bonus.

As a person who really only has two opportunities a week for instances, I'm often incredibly frustrated when I do one with my priest, rogue, and warlock.  I've never had a problem with my warrior because I was able to lock aggro, and there is really not much people can do to ruin an instance when you lock aggro.

I did preface my choice of warrior with the caveat that they are willing to spend some  out-of-game time learning about holding aggro.
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I agree with this fairly well. The only gear that matters when you're tanking properly is the gear that makes take longer to die. All the aggro I generate as a tank is from low-to-no damage skills like Sunder Armor, Revenge, Demoralizing Shout, and auto-attack, and that last bit is both the highest damage output and the part that only matters for rage generation.