Not most divisive, but just to bring something new to the table:
Command & Conquer: Red Alert 3. Just yesterday I was playing this on Steam and one of my friends messaged me saying "Go and play one of the good Command & Conquer games!" When I asked him what was wrong with it, he just said "it's not as good as the others".
Well nice objective analysis there. The land, sea & air combat I always remember is still there. The campy, ridiculous time-travel storyline is still there with live action cutscenes. The skirmish mode with tonnes of possibilities is still there. And it's enhanced by some great new stuff like fully co-op campaign and dual abilities for every single unit in the game.
Yet for some reason it gets a lot of flak and I have no idea why. If you want to see a bad Command & Conquer game, look no further than C&C3 (disclaimer: I haven't played 4 yet. Because 3 was so bad).







