Homeworld

The Good
Homeworld is a RTS game that doesn't play like an RTS game. Skipping the standard-build base, mine resources, build army, kill enemy- order of events; Homeworld creates a unique RTS experience by running the player through a continuous series of missions that arc over course of the game. Your fleet remains intact from mission to mission (barring ships destroyed in combat), and as the game progresses you steadily gain power, as do the enemies you face. This approach, along with Homeworld's revolutionary 3-D space movement system and the ship AI make it a top notch RTS game that is engrossing and very enjoyable to play.

The Bad
However, the game is not without its faults. The 3-D movement interface has a large learning curve so don't expect to get good at it until 2-3 missions into the game. Additionally there is very little differentiation between the two "sides" you can play. Ship design differs radically but actual ship capabilities, weapons and systems are virtually identical except for a few not very effective "special" ships that are unique to one of the two alien races.

The Bottom Line
This game is a real time strategy game set in space. It combines elements of campaign based strategy games with the RTS gameplay features of resource collection, technology research and fleet construction.