Command and Conquer: Red Alert 3 is well-executed, very fun to play, and a fantastic, worthy addition to the C&C franchise and RTS gamers' shelves. It's also darn funny.
RA3 plays pretty much like most RTS games. The most innovative new feature is that you can play through the campaign co-operatively with a co-commander, who can be an online human player or -- if you're playing solo -- a reasonably competent AI commander that you can command with basic one-click commands (attack, guard, hold, etc.)
The story begins with the Soviet Union on the brink of collapse. In a desperate bid to set things straight, the Soviet leader (Tim Curry) travels back in time and kills Albert Einstein, hoping it will eliminate the Allies' technological and military superiority.
Unfortunately, he returns to his present time to find the leader of the Empire of the Rising Sun (played by George Takei) -- backed by a massive army of robots, ships, and other technological marvels -- issuing ultimatums and making a bid for global domination -- beginning at the Soviet doorstep.
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Overall
An excellent RTS game that easily deserves a spot on every RTS fan's shelf.