Only if we're talking about factory-standard cars, and only if we're comparing to saloons based on the same CDW27 platform.
When all a car really needs is a strut brace and maybe a thicker anti-roll bar to be tractable and docile when it needs to be, I simply can't call its handling "awful". I absolutely love how it feels as stable as a mountain goat, even though it's sitting on 18s and should be aggressive as hell. I've never driven anything quite so trustworthy.
This is a car that I transported T's sister home in with half her skull missing. In snow.
The Cougar has its faults, sure. Plough-on understeer in the V6. A slightly "crashy" way of dealing with vertical loads. But the first is designed in, and the second is there because... well okay. The World platform was never intended for a "personal sports" car that genuine Mercurys were.
Looking through the lens of owning a motor built in the last century, I really can't fault it. Seriously. I just paused for a few minutes to think of things I don't like about it, and all I could come up with were things that are present in Tracey's new Glof. And not one of those things relates to how it holds the road.
You want a car that will chew you up and spit you out because it hates you? Buy an Astra.