Regarding the size of the Death Star, purely from a viewer's perspective - what I feel is lacking is a composition shot where you get the scale. ANH had two such "reveals", as the Falcon approached the station, captured by the tractor beam, and later as the X-Wings and Y-Wings "descended"upon the station for their attack. Both scenes gave a great sense of scale.

In RotJ the fleet action is taking place, at leas initially, relatively far away from the Death Star, yet later we immediately cut to a shot of the rebel fighters on the surface, starting a "trench run". There wasn't such an imposing, thrilling shot as with the X-Wing descending upon the huge, impossible target...

Even the shuttle scene in the beginning establishes the scale of the Star Destroyer escorts (and does so quite well) better than the arrival in the station. The only such scene is the relatively short parade of the TIEs in front of the hangars as the Emperor arrives.