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Well, I don't know. The TW series isn't new, but it still releases good games (although the gameplay doesn't change much, which might be the reason for its success). I wouldn't say that Civ 4 is worse than Civ 2. So, I don't think that everything new is worse than the old, but it will definitely be the case if developers prioritize profit over everything else, which is a very noticeable trend in Heroes 6.
By the way, Total War is indeed an exception! With each installment, they add something new, and it's not worse than the previous one.
I haven't played Civilization; it's not my kind of game.