I essentially agree naznatips, but I think that it stays so similar because of the highly competitive fanbase. Starcraft 2 looks like a mere update of the first starcraft. After aaaaallll this time there will be mildly improved graphics and a few new units. Why? The highly competitive nature of the game. It was perfect the first time around, and the players had the game down to a sweet science. You don't want to mess too much with perfection, lest you piss off the people buying the game. Alpha 3 is definitely more complex than Street Fighter 2, but it's still a very gradual evolution. You never want to stray too far from the perfection that everyone was used to.
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