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It feels like it makes you do an awful lot of work to accomplish things that were simply a few clicks in WC3 like setting up basic dummy units/abilities/etc. The aforementioned data module is probably the closest thing to a downside for me and a lot of people. You are still fully capable of just using dummy units (or dummy actors) and triggers to accomplish all the things you could in WC3, but with a much better trigger module interface. There's a lot more to learn, particularly the object editor (data module) but if you want to, you can ignore the data module for the most part and just copy existing units and alter the basic fields it's still a little more time consuming than the WC3 object editor, though.
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SC2 editor is straight up superior for all practical purposes, once you learn all of its ins and outs.
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