I've resisted writing this for a couple of weeks, but have finally decided to make it short and not-so-sweet.
Don't bother going to Daddy Jack's on the Dallas North Tollway (just north of Frankford). In fact, I suggest you stay far away from the place. We were there on a Sunday night a couple of weeks ago, and the food was awful. My halibut had such a strong ammonia taste that I thought they had accidentally used week-old bluefish. My wife's stuffed shrimp tasted like scouring powder.
After talking to the manager (who had plenty of time, since there were only two other tables with customers that night), we learned the following:
Daddy Jack's on the Dallas North Tollway is owned by someone other than the people who own the original (and still great) Daddy Jack's on Lower Greenville. The plan is to "franchise" the DJ name, and the new owner is building another one in Frisco. I won't be going there anytime soon, either.
The restaurant had lost (or fired) its chef two days before our visit and the new chef was "trying out some new recipes." (In my opinion, he should have tried using fresh ingredients instead.)
The manager herself was leaving that week, and she said most of the waitstaff was moving on, as well. She was nice enough to comp our food, which was a good move considering that we didn't dare eat it.
It's possible that this was an aberration, but I won't be going to back to test that hypothesis. The original owners of Daddy Jack's should watch out, or their own "franchise" will be diminished by this new owner's lack of commitment.