You can watch Rebels as a standalone without watching Clone Wars. But there are a lot of characters that come across from Clone Wars, and you might feel like your missing something in terms of backstory of some of the characters.
The Maul stuff was set up in clone Wars as was the Ashoka Tano stuff.
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My name is Ozymandias, King of Kings;
Look on my Works, ye Mighty, and despair!
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