its a lot like sc1, but as ppl said with better graphics, some new units and play techniques.
some other good things about it is with multiplayer there is tiers bronze, silver, gold, platinum, etc which you will be ranked in as you play games. This makes it so if you do a random 2v2 your playing with/against ppl with approx the same level as you. This is a huge upgrade in my opinion because unlike sc1 your not grouped or playing against ppl which are total noobs or pro koreans.
I havent done the campaign yet, im a pvp person
If you enjoy multiplayer rts's no reason you shouldnt get it.
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Koddo