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I was reading this article on IGN and felt it was appropriate here.
"Ultimately, though, what people really need to do is ask themselves if any of the games they recently adored are really original. I love Call of Duty, but it really just expands upon what John Carmack and id did with Doom, Quake and other shooters. Or hey, I love Star Wars: The Old Republic, but I'd be crazy if I couldn't admit it learns from, and is heavily inspired by, World of Warcraft. Warcraft also wasn't the first RTS, either, but developer Blizzard helped tweak the genre in ways that have subsequently defined it for years."
I completely agree, and have for a long time, if you look hard enough you can see a clear evolution in each genre, if you want to look hard enough. It doesn't mean everything is exactly the same, but much of what we have now, has been done before in some fashion or another -- and that doesn't make them bad.