Veteran Sergeant wrote: What if his Marines are purple? Then does he just get to play using none of the Codex books? Poor bastard.
My Marines are purple... And I don't even like Slaanesh much, either.
Personally, I don't like how half the codices are Spess Mehreen derivatives. I would love to have one big Codex Omnibus: Space Marines, and would even go as far as to consolidate Sisters of Battle and Grey Knights into Codex: Inquisition. I find it unfair that there are at least six separate codices for Space Marines, but Chaos is all crammed into one book. (Oh how I would love an Alpha Legion or Iron Warriors codex...)
Edit: Was going to make a point but got sidetracked. The best thing about Space Marines is that they are simply suggestions. C:
SM is just a catchall for if no other codices catch your eye. Remember that Space Marine Chapters can be founded and split up into different groups, and as they are derived from the same geneseed I see no reason why they wouldn't have the same rules or abilities.