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I liked the second stage the most; the first and fourth stages were also good for blitz. However, I didn't like the third stage – it required a lot of battles, and I don't think this stage was very suitable for part of the blitz tournament. I didn't play the fifth stage at all, so I can't say anything about it.
Overall, my impression of the blitz tournament is that I didn't get quite what I expected from this tournament in terms of the proposed tasks. I would have liked to see at least one purely combat-oriented stage (for example, winning a specified battle with the fewest losses), but there were no such tasks :(.