Latin Question

Does anyone actually know how good Tacitus, Seneca, and Lucan really are? I mean, I know what they're like, but to what extent do they reward close study? To what extent has all of this silver age stuff been neglected? Does Vergil really deserve his imperium sine fine in the real of poetry? Is Cicero really the summit of Latin prose? Is Seneca actually the next best thing we have after Euripides?

Just curious!