Tornados
Yes they required a relatively high maintenance man hours to keep them serviceable. Hardly surprising given when they were being designed and developed.
And of course, Tornado was easily the most advanced and complex fast jet of its age.
But at that time, MMH was not a big issue and in fact was not part of the certification requirements (unlike Typhoon).
The main requirement was mission capability. And in that they performed extremely well over the changing requirements during their life cycle.