I don't know why but whenever I get "limited charges" items in games.. I tend to just not use them at all, ever.
Furthermore... many of these weapons with 7-8 charges require a very exepensive skill point to be spent in a skill tree I would otherwise never spend (usually magic skill on a pure melee character).
Like hell I'm going to spend a point in Lightning or Fire magic on my minotaur barbarian just so I can use a weapon charge 7 times !!!
What a terrible concept. If the weapons could be recharged at a crystal now that would make it worth it. I know there are shards that recharge weapons but those are ultra rare and can't be crafted afaik.
I hope they change this in a future patch