Wrong.

When packing a bowl, you want to break the weed up as good as possible to promote complete, and uniform, burning. The closer to granualization, the better. I like to use a grinder as that breaks up herb excellently, without loosing a bunch of crystals to skin contact (they stick to your fingers then you cant smoke 'em!!). Plus its a hell of a lot quicker.

Of course, grinders are nothing other than a luxury. Just break your herb up good (any nuggage will smoke less than ideally). A lot of people don't break up a bowlpack as good as a J, but then your bowl burn quality suffers...