I personally think this is 40k right now. It is times ten my single biggest problem with the game currently. You are either on the imperium were you get everything and the kitchen sink, or you are xenos and your books are made up of nothing but compromises. The problem lies no in the Space Marine codex (which is one of the best Codex's to date baring some minor points tweeking) but in the successor chapters, as they are all the main book, but more powerful. It isnt a new thing of course, as the last 3 editions have been this way, but it is just getting more noticeable now because of the 7 codex's released in 5th ed, FIVE have been imperial. Really makes a guy want to play Fantasy