It sounds like the meat you had just wasn't cooked right or with enough smoke or smoke at all! Landarc is right that chopping usually is an attempt to hide flaws and it also causes moisture loss on its own. There are so many factors involved- it could have been reheated too much, cooked too long, not cooked long enough for the fat to render properly and add moisture, etc.
I'm in Georgia (near Atlanta) and even at the places that are "known" for decent brisket here, I have been far from impressed. My last experience was like yours- no real smoke flavor on it. Time before that it was so dry the slices crumbled into bits and all you could taste was smoke and no real beefy flavor. I've only seen one decent example here, so I think I'm going to keep trying out at home instead of dropping money on it.