Merrick's is a good food, but the cats seem to get tired of it fast, so I only feed it a couple of times a month. The only one I've seen them snub was the California Roll flavor. It had a lot of cucumber/veggie bits and they tend to dislike that. Cowboy cookout and Turducken were both hits.
I'm lucky that there's a local pet food store that stocks it by the can so I don't have to buy a case. Also the cans are not the usual sizes, I think the smaller can is slightly more than 3oz (3.2, I think) so my can cover doesn't work with it