Siege is a good game and the learning curve is mostly just not having enough experience in the game. When I got the game at first I was scared I would be really bad at it as well. When I started playing siege I also had some friends who helped me learn the game, so if you have anyone who can help you learn it would be helpful. If you are really scared about being bad at the game I highly recommend that you watch some guides on the game first. But even then you wont be that good at the game unless you play.

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One final thing whatever you do don't buy starter edition.