I went ahead and got the MKC all weather floor mats and cargo mat. I have lots of generally good experience with Weather Tech mats (both the "ribbed" version and the more flat liners) in four previous vehicles.
The reason that I got the mats from Lincoln was that I wasn't sure if Weather Tech would have their mats perfectly sized for the MKC. I had a bit of a disappointment with Weather Tech on a 2011 Buick Lacrosse about 4 years ago (had to trim to size). That was my only hiccup with them. I had seen the Lincoln mats in a demo MKC, liked how they fit and looked, and decided to go that route. They won't hold a quart of water, but I'll just kick most the snow of my shoes and I think they'll do fine. I really like the look of the rear cargo mat, with a good looking MKC logo.