Yeah, warriors do run into some aggro problems prior to getting high end weapons (and Cmal3 gloves). Paladins have identical probles if their spells don't land (i.e. on raid mobs). Not sure about SKs, but I think they have an unresistable line of aggro spells.
As for exp groups, generally when I'm grouped with Kathor there are no aggro problems as long as I wait to slow until the mob is a little lower. It's a fair tradeoff--when Ritt is tanking I can slow on pull, but he's got a good 600 or 700 less HP and around 100 less AC.
If it weren't for Cmal gloves and proc weapons, though, warriors would be pretty hopeless in a high DPS group. The idea of more proccing weapons sounds good, but I think more clicky aggro items should also at least be considered. Possibly a line of class-oriented quests with a gradually improving clicky . That offers a little more consistency in a warrior's ability to hold aggro than weapons which may go two fights in a row without proccing. Obviously you wouldn't want a level 25 to be able to quest an item that generates as much hate as a high end weapon proc or pally/SK spell. If the idea were to be implemented, it might even be worth making a new line of spells for the clicky items which scaled from, say, half as much aggro as one of the low end stuns (cease/desist) in the 20s up to something comparable to a blind in the 50s.
I would also suggest a moderate recast time, maybe 10 or 15 seconds, with a lasting effect (debuff-style) so that one resist wouldn't make the item useless for the rest of the fight à la Cmal2 gaunts with a minute-plus recast, but so that you couldn't chain cast it for unlimited aggro. If the effect stuck on the mob for a minute, it would give a solid boost to initial aggro, and wear off for an added boost on hard fights where you might have casters start burning, but it wouldn't be enough to remove the necessity for caution and teamwork in groups or lower end raids. It also wouldn't be enough to reduce the utility of paladins or SKs.
