I, admittedly, have not had anything at Duckfat other than their Belgian fries, fried in, well, duck fat. And in the effort of full disclosure, I should let you know that I've only had Duckfat's fries twice.
But the second time I had them (and yes, I was eating only fries for dinner, what of it), I was not blown away. They were a little soggy, and I found myself searching for the smaller, crispy ones. The Thai chili sauce that I ordered tasted like Velveeta cheese mixed with salsa. And I say that not just to be mean, but because it really did.
I have heard this opinion echoed from several other people- that the fries at Duckfat are no the longer, "crispy on the outside, melt in your mouth decadence" they once were.
So while I have only been to Duckfat twice, I'm not inspired to go back, as I hate being disappointed over fries, especially ones that have so much potential.