Mission objectives were met. Getting it back intact would have been a bonus:
This suborbital flight is designed to test a number of objectives, from how the vehicle's three Raptor engines perform to the overall aerodynamic entry capabilities of the vehicle (including its body flaps) to how the vehicle manages propellant transition.
SN8 will also attempt to perform a landing flip maneuver, which would be a first for a vehicle of this size.
With a test such as this, success is not measured by completion of specific objectives but rather how much we can learn, which will inform and improve the probability of success in the future as SpaceX rapidly advances development of Starship.