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well i don't really think there are unuseful units, because all of them have their use in certain situations. but battlecruisers and carriers are less seen just because games rarelly go that far and in long games, people tend to go for combinations of other units (colosi, immortals, stalkers) (marines, tanks thors, vikings). As for the zerg, even the ultras and broodlords are very often used and relatively easy made.
well i don't really think there are unuseful units, because all of them have their use in certain situations. but battlecruisers and carriers are less seen just because games rarelly go that far and in long games, people tend to go for combinations of other units (colosi, immortals, stalkers) (marines, tanks thors, vikings). As for the zerg, even the ultras and broodlords are very often used and relatively easy made.