RakeW: I definitely don't agree that both games are exactly the same in gameplay.
I didn't really say that. Well, if you focus on the word "gameplay" only, I actually said it, but even that is correct: The way you play both games is the same. Some new support options don't change that. Other than that I tried to describe that Blitzkrieg 2 is the better game, because of many different reasons. Overall the developers improved what has worked well in the first Blitzkrieg, while cutting off (some) ballast.
You also have to focus on the initial questions: "I have not bought either of them yet. Should I just pass one and buy 2? Is there much difference in them?" For a person new to this series, you can't argue with existing differences between those two games, that you will only recognize, when you have played both of them. If someone truely loves this series,
of course he should play Blitzkrieg 1 and 2! But you can still do that after having started with the second one, which in my opinion remains being the better game by far.