The total reinvention of the Klingons for the spin offs never really gelled with the Klingons from Kirk's era. I enjoyed what the writers did with them at first but their culture soon became tiresome and predictable. That doesn't take away from the fact that many of the Klingon characters were excellent despite that. Worf, Martok and Gowron are some of my favourite characters. In a way Gowron in the end became a sort of callback to the original series Klingons when the power went to his head and he became ruthless and without honour. I enjoyed the dishonourable Klingons a lot more than the oversimplified Klingons who lived by their honour. Duras, Gowron, Chang, Kruge, Lursa, B'Etor, Regent Worf were all great villains to watch.