I believe that intellect no longer affects the rate at which your weapon skills increment. Just grab the weapon(s) you want to use (or faster versions of the same type), head to some low level zone, and slaughter everything that moves. You will get skill increases for using the weapon, and it doesn't matter if the target is near your level or not. I'm pretty sure you can even get skill-ups from critters. The closer you get to your max, the slower the rate of skill-ups.