Some cars are amazing to drive, they just feel so planted and 'correct'. Others are less perfect, but are perhaps more of an 'event'. I think a Maserati falls into the latter category.
Call me odd, but I actually enjoy the certain foibles and imperfections of cars, it makes me extend my driving skills. My Kia diesel, for instance, is horribly flat in the lower rev ranges but you can 'launch' it by dabbing the clutch whilst your foot is on the loud pedal.
Having said the above, a good steering rack is probably the one thing though that I can't live without. The last GranSport I had was excellent in this regard (felt a little better, oddly, than the previous GS), however the new QP I recently drove fell short, and consequently I began to doubt how good the new Ghibli might be.
I think the Porsche Cayman kicks the butt of almost anything. But Cayman vs 4C actually will not be a choice for most, due to the low number of production units and associated waiting list for the latter.
I think the 4C will be somewhat like the 8C in terms of perception: quickly forgotten after launch, a bit quirky, but appreciated when seen.