There seems to be a great misunderstanding in EQ concerning agro. That is: the number of touches determain agro. Number of touches is only one of the factors in determaining who holds agro. And a minor factor at that. Far more important in determaining who holds agro is damage. Nine times out of ten he who does the most damage holds agro. Therefor if you want to hold agro you need to maximize damage. This is why the mob turns on the rogue after that high damage backstab, or on the wiz after that high damage nuke.
So you might ask,if damage is more inportant that number of touches why do so many people believe that they need to use fast weapons in the primary? That is easy. At high lvl you have a high damage bonus. This bonus for one hand weapons is only a function of your lvl and not the delay of the weapon. Therefor with a fast weapon you hit more often with your damage bonus, and thus do more damage. So yes at high lvl you want a fast weapon in your primary hand.
The question is at what lvl will the fast weapon out damage a slow weapon that has a better ratio (dose more damage without the bonus added in). Well this is a function of the weapons being compaired. However since we are in the Wurmy Post I'll just talk about when the wurmy.
Very few weapons with a higher ratio than the wurmy will out damage it before the mid 40's. Most weapons will not out damage the wurmy until after lvl 50. Many weapons that are faster than the wurmy will never out damage it. The centi longsword is one of them.
The one draw back to using the wurmy at lower lvls is the fact that it slows down your skill development.
From lvl 20 to lvl 50 the wurmy is still one of the best weapons in the game.