The drones that collect crystals and gas can also mutate into living buildings. Units improve by evolving the species to gain range, speed, or powerful new abilities. The lowest of Zerg units are especially cheap to breed, but have little capacity for damage. Unfortunately, most people find that the Protoss overshadow the other races, but only slightly. Graphics, of course, are splendid, but we would expect no less.
Animations are fluid and nicely detailed.
You'd actually think you were watching the movie Aliens in some of the fights against the Zerg. Another intriguing aspect of StarCraft is its interesting storyline. Here's the next location we attack. I can find fault with anything. And, yes, I see some issues with StarCraft.