A lot depends on what you want and how you use the MKC.
For me... there are rarely more than 2 adults in the car. Occasionally 3, sometimes 4, never 5. I would hate to be the 5th (adult) person in most cars these days. Cargo space is more than we will probably ever use. Even on trips with 4 people. Anything that I buy that won't fit and I will get a $19 Home Depot van. Even on large items that might fit, I would probably rather get the van rather than risk scratching up the interior of the cargo area. That is what happened on my last SUV.
I'm 6'2" and I don't have the front drivers seat quite all the way back in my normal driving position (close but not quite all the way back). If we have 4 people, we put the tallest person in the front passenger seat (usually another guy - so we can talk), the smaller folks in back (usually the women so they can talk) with next tallest behind the front passenger and the smallest behind the driver. Not a huge deal once you just think a bit about arranging folks. the back is small, no doubt about it. It feels cramped when you are in there - opening the vista roof shade in back does make it feel a bit larger. People in the back are not an everyday thing.
On the everyday side... the mileage with the 2.0L has been impressive. On day-trips, with mostly highway, it has been great - coming close to 30MPG - depending on how aggressively I drive. Around town 22-23-24. Turning radius, amazingly small - great on u-turns. On those divided highways/roads with small medians, I can now u-turn easily into the left lane rather than drifting into the right or even that extra bump out they have on the far right for u-turns with land barges. Great in parking lots, the MKC fits well into tighter parking spaces and not stick out - like in the short spaces where the lamp posts are. It also fits well into those spaces at the airport marked compact vehicles only - always a plus. I was able to grab a close spot on my last airport trip - almost worth the price of the car itself!
Continuing on the everyday side of things, the front seats are amazingly comfortable. The AC seats are so worth it. The finesse of the THX sound system is amazing - not loudness, but clarity. The overall sound system experience is enhanced by the overall quietness of the MKC.
What is weird, it that despite it's smallness, the car feels big to drive. I also have a 2013 MKZ-H and the MKC is something like 14-15" shorter than the MKZ - and I thought the MKZ was a small car! I would swear that the MKC is larger than the MKZ when driving it - I think because you are sitting up higher and the broadness of the hood.
I did a lot of research and searching before getting the MKC. I was not planning on getting a 2nd Lincoln vehicle since I sort of like to have two brands in the garage to experience what other brands have to offer. My decision was based on the everyday things, not the occasional things. It was also based on price, I could get the fully loaded MKC at a more reasonable price and it has the tech available that was important to me.