I haven't played Red Alert 3 as of yet, but that's only because I don't have a good enough computer to play it and I wouldn't dare disgrace the title on Xbox 360 with a controller... I just don't think it would work very well without the full keyboard
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I have played Red Alert 2 and Yuri's Revenge along with all of the past Command and Conquer games except Kane's Wrath because I thought that both of the new Tiberian games were... not to my expectations x.x