Where the titans bad or good of Greek mythology?

I suppose it depends on whose point of view. Like the previous answer, it does vary by each Titan, but as a whole...

The gods considered the Titans, as a whole, to be evil, their enemies. There were exceptions, of course.

Humans, not so much. Under the Titans, humans had their Golden Age. Under the gods... the gods were laughable incompetent and corrupt. Humans suffered underneath them.

Granted, this is all opinion, but in a hypothetical situation where I, as a human, had to choose between throwing either the Titans or the gods into Tartarus, it would be the gods every time.