Board Thread:Warhammer 40k General Discussion/@comment-5846164-20130516215639/@comment-3258762-20130519155637

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Kadjah is on the right track. The Ultramarines biggest flaw is their arrogance, meaning a lot of chapters highly dislike them and few of the more notable chapters (All first founders, Black Templars and some others) respect any command or advice the Ultramarines give.

And they really are insufferable pricks.