My Dad has a 09 MKZ with is Lincolns version of the Fusion & he hasn't had any problems at all with his.
Now that you mention it, my Mother in Law has an 07 Zephyr, which became the MKZ. It's at least a 5 speed, if not 6. But it's a good little car, they enjoy it. They had owned 3 Cadillac's prior to this, and like this much better.
I will say this though, it's not made for tall people.
I didn't realize they were the same platform. DUH!!