I have caught some nice specks and reds on DOA. I usually just bounce them off the bottom and work them in the current. Work them slow and twitching. One of my "the big fish that got away" stories was on a DOA in the surf. A big speck blew it up about six feet from me. Surprised (scarred) me so bad I yanked it right out of his mouth.
Absolutely. I use them quite a bit in early to mid fall when the shrimp are pulling out of the estuaries. They are also good for finding fish when things slow down a little. They make a swimmng minnow with a curly tail, comes in black/silver, red/white and some other colors. A few years ago I fished the black and silver around the rocks in Pensacal for several days, it was a great bait.