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My favorite is the fifth installment. The graphics are cool, but that's not why I love it. In my opinion, it has the most interesting and diverse hero progression, and a good, even excellent, balance. The tactical aspect is also well-done; the battles are more varied, and with the right strategy, you can easily defeat a stronger army. In the third game, you can probably do the same, but it's all simpler there. The plot, in my opinion, isn't very important. I play through a campaign once and then forget about it, playing against the computer or online. Although, in the fifth game, the plot is decent, in my opinion. I would put the third game in second place because I haven't played the first and second games, and I didn't like the fourth game.