Check at the top of this forum and in the turkey thread, you'll find Brining 101.
It's not so much that it's drier, but that it can dry out REAL quick if overcooked. Brining adds moisture and flavor and gives you a little bit of wiggle room with finishing temp.
Pork doesn't HAVE to be done, but is enhanced by doing it.
Pork chops do great with it. There just isn't much fat.
Huge pieces, like pork butts, would take to long to brine, but I know some that inject a brine to get it to work faster.
That being said, country style ribs are PB sliced up.
If you're up for it, I'd definitely brine them.
Try an experiment. Find a brine recipe and brine the ribs for 6 to 8 hours and some, don't brine. Compare them side by side to see if you like it, best way to know.