If you played the original Dune 2 by Westwood, you realized that the RTS genre haven't really change that much at all with the exception of improved UI, spiffier graphics and RPG elements added to it.
The biggest draw SC had over the rest of the RTS during the genre's golden period was the unique 3 factions' unit and playing style. A lot of RTS still relies on the tech up and tank rush strategy but in SC, even weak low tech units like marines, zerglings and zealot remained deadly throughout the gameplay and are often key to a number of pro-player's strategy.
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