DDD is a good background show, usually when we're winding down for the night we turn it on if there isn't anything else. It seems to be on all the time during weekday evenings.
My favorite FN show right now is probably Cutthroat Kitchen, yeah it's a Chopped/Iron Chef ripoff like 90% of what Food Network airs now, but it's pretty funny. It desperately needs a refined judging system though, it can be painful at times to witness as is.
I wish Iron Chef would be good again, hell it seems like everyone on the network is an Iron Chef now, it doesn't mean anything anymore.
Worst show is hands down Mystery Diners. Blatantly fake restaurant stings. One episode had them bring in the "Mystery Diners Spirit Medium" to communicate with ghosts in a restaurant, and they would "interfere" with the camera equipment.