Most are pretty recent, but I think thats more down to a surge of quality TV willing to invest in arc plotting after Babylon 5 managed it.
1. Game Of Thrones - not perfect, or as good as the books. But Peter Dinklage more than makes up for the flaws. Plus copious boobage never hurt anyone (apart from teenagers with sprained wrists).
2. BSG (Remake) - Usually very good, at its best, sheer brilliance. Let down at the final hurdle by the lack of any coherent cylon 'plan' and dropping any pretense of ambiguity about a supreme being.
3. Ultraviolet - a UK show that sadly lasted one season. A quasi-paramilitary anti-vampire unit of the Inquisition funded by the Vatican, with kill squads using graphite bullets? Yes please! Introduced Idris Elba in full on badass mode, plus Stephen Moyer as a vampire prior to True Blood.
4. Firefly - it died too soon. Movie was a bit underwhelming and the reavers make no sense whatsoever.
5. The Thick of It. - Malcolm Tucker is ******* brilliant.
Breaking Bad, The Wire and The Sopranos just missed the cut.