Show Robb would be a worse king, I think, than book Robb, because book Robb at least had honor going for him while show Robb is both stupid politically AND dishonorable.
my worst thing about show Robb is how they made him into a huge hypocrite by saying "I don't want to be that kind of king" in regards to just taking whatever he wants/doing whatever he wants and then in the very next episode he basically does whatever he wants without worrying about the consequences.
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http://i.imgur.com/PQGPX.png