There's going to be at least 3 times as much content as a single game would have, but this is a game where buying the expansions is necessary to see how the main story arc ends. Not buying the 3 parts is going to leave you with an incomplete main story, as there are sections of it revealed on every part.
That said, many games have endings that aren't really much of an ending, and are obviously going to continue into the next part (like in FEAR, or why not BW itself). At least with SC2, you won't need to wait several years to know what happends next.





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