As the review actually states, the tail - happy nature of the car is progressive (i.e. something which is controllable and car be learned). (evo.co.uk)
The precise steering and its tail happy nature keeps you engaged throughout and keeps the adrenaline pumping.» (motorbeam.com)
Owned a C63 for a while, but its tail - happy nature at almost all speeds and all but the very driest weather soon got old. (evo.co.uk)