50s had way too many excellent written dialogue films. 90s is too high. I would say the 30s as well. Blocking was way too poorly done then. Personally I can see why you'd rate the 70s so high but to me it's below the 80's
60s/50s/40s/80s/70s/90s/silent era/late20s+30s/>
>>2000+ each year worse than the last