I work as a valet, and I've driven many manula transmission cars. Out of all that I have driven, the top three clutches that I have found are hardest to drive and get smooth shifts from are:
1.) Ferrari 308GTS (only Ferrari I've ever driven, and it was an '85)
2.) Older Toyota pickups
3.) Manual Contours and Mystiques
I'm sure that many people will agree with me that the Contour and Mystique clutch is the hardest to get used to to be able to shift smoothly. My dad who's driven a manual car for over 30 years still has a hard time shifting smooth (not as good as I am either

) in my car. It's just a clutch you have to get used to.