I'm speaking of gear that you can only get with crucible marks. It is not as good for PvE as raid gear is. So if you don't PvP, I don't see why you'd even want gear that can only be bought with crucible marks, if raid gear will further increase your light level and therefore performance more. Granted, you need to be at least level 26 to do the raid, that's why there is gear that can be bought with vanguard marks that can get you as high as 28, or 29 if you have an exotic piece.