One of the best effects shots in Revenge of the Sith is when Kenobi is leaving for Utapa or whatever and he and Anakin have a conversation. then they film the Venator taking off and the camera shakes and you just feel the power of that ship as it tries to escape gravity.
IIRC from my Star Wars Lore, the Imperial Star Destroyers weren't built to land like the Venator. the Imperial Star Destroyers were nearly 2 kms long someone once calculated its mass at 40 million tonnes In the EU the only vehicle of its class designed to land on the surface of a planet was the Victory Class Star Destroyer. The ISD used landing barges and shuttles to land its assault forces.
The Venator was a lot smaller at 1.1 kms and someone calculated it at about 17 million tonnes because its main body is mostly empty hanger space unlike the ISD which had much smaller hanger space.
The Acclaimer Class that we saw in Attack of the Clones was 750 meters long, was something like 15 million tonnes but it was designed to land on water and land using a repulsor lift system.
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