I do wish that DL would get something like they have at the MK at WDW. Two different hamburger places with fixens bar. Grilled onions, grilled mushrooms, lots of extra stuff.
Since off-site locations were mentioned - Ruth's Chris $8 happy hour Prime Burger with fries, although the filet mignon steak sandwich is a better deal in my opinion. The main issue is finding a seat at the bar, as they won't serve happy hour food specials to someone who doesn't have a seat. They will serve drinks until you can snag a seat.
Honestly, I know it isn't everyone's first choice but we really like the burgers at TPG, the fixing bar is good and we doctor up our burgers and fries or rings.
For chicken burger I love the "chicken sandwich" at Whitewater Snacks. It is a grilled piece of white meat on a hamburger bun with roasted chili peppers and guacamole. Yum! And it is so quiet and peaceful in there. A nice break from parks but an easy walk from the GCH exit in DCA.
We tried them. We either went to a bad location or our tastes are vastly different than Californians. LOL! We thought they were barely edible. Of course it all started when we ordered. When the little guy taking our order said they didn't have mayo for our burgers we were dumbfounded. We stood there mouths agape totally speechless. I still don't even know what to do with that. I can't do a cheeseburger with no mayo. Cannot. The fries had no taste. The animal fries were...I don't even know how to describe that. They were something. I don't want that something again. LOL!