With 90% probability the sum of the masses of the three neutrino masses is between 0.13 and 5 eV.

See page 4, Fig 2 of:

http://arxiv.org/abs/astro-ph/0304536

This is information about the neutrinos which was not known using other means, and therefore this area of research can be called ''scientific''. The fact that it doesn't predict an exact value for a neutrino mass doesn't imply that this isn't science.