  We introduce exposure as a means to making balanced comparisons of the
sensitivities of long-baseline neutrino experiments to a nonzero \theta_{13},
to CP violation and to the neutrino mass hierarchy. We illustrate its use by
comparing the sensitivities of possible upgrades of superbeam experiments,
namely NOvA*, T2KK and experiments with wide band beams. For the proposed
exposures, we find the best nominal CP violation performance for T2KK. For
equal exposures, a wide band beam experiment has the best mass hierarchy
performance. The physics concept on which NOvA* is based has the best potential
for discovering CP violation only for exposures above a threshold value.
