Why not just actually give the criticism? Surely you don't actually expect people to watch a 50 minute video when you could just sum it up in seconds.
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Because if you just give the criticism you can't go into as much detail. It makes it easier for people to just dismiss the critique with the "Well, thats your opinion" cop out. However, if you bring up a topic, like poor level design, and then show examples from all three games, and further explain why its bad in DS2, then its harder for someone to just dismiss it.
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The middle paragraph shows a fraction of the problems in my subjective opinion. Summarised in very few words: It's not memorable. It's not an experience of strong feelings - It became 'just' a game.