As Xanthippe says, 1970's TV looks different by comparison to today's TV.
However, Dick Turpin ( as far as I remember ) was shot on film, whereas I, Claudius was studio-bound ( again, from what I remember ), so the approach to the directing was often very different.
Sometimes those old series do stand the test of time.
Catweazle ( shot on film )stands up very well I think.
I think your appreaciation will be in relation to how much you loved the show when you originally saw it.