It's 2008 and Gustav is making me review a game from 1998......
After you finish the Terran side of the single-player you get to the Zergs' campaign where you are A minion to the great "Overmind". Fulfilling his plans to infest the various planets and ultimately take over the universe. The Zerg are all weak and basically their strategy for winning is by numbers. While the Terran produce one unit, the Zerg can produce eight in the same amount of time. After the Zerg you play as the almighty Protoss, whom seem to the most established race in the universe of Starcraft. They are very political and in their campaign while you try to evaporate the Zerg forces you will be turned upon by your predecessors and a good amount of missions will be fighting against other Protoss. The Protoss play out as the bulldozers. Their units are strong and they have no minor fallback to their race except the slow production rate and trying to get some of the units up the stairs.
After the campaign mode is over there is really no replay value at all. Their are custom play games in which you can play already designed maps and half built scenarios. You can also create your own map/scenario and play it alone or online (not so sure how many people still play this version online but..) against others. After a while, however, this game gets very repetitive. Even thought all the races have different aspects about their gameplay style, they are all essentially played the same way. So after about three hours of playing as the same race all their "tricks" they have that the other races fade away and you are stuck wanting out. You can beat the campaigne mode in one day and the custom matches just don't offer up any fun "extra play" that might exist. So that may be the only drawback of this game; you finish campaign mode and then uninstall it.
All-in-all the gameplay of this game is just like any other RTS game; very time consuming and generally fun. The graphics are horrible but then again it is 2008 and this game was made in 1998 so I cannot complain. The sound is okay and the voice acting could be improved. Whether you like being the good guy or being the bad Zerg and annihilating everything in your path if you are looking for a decent "oldie but goodie" then I would suggest getting this game.