I agree with the comments made, it's set up too safe meaning not enough front grip and long wait between gear changes.
I know the chassis has lot's of potential on both the roadster and fortwo with bigger tires in the front.
The fortwo was not intended to be a hot little sports car but the roadster just beggs for a manual transmission or a dual clutch automated one.
Both the roadster and the fortwo can easily be tunned for better handling.