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The mandatory armor color change in sPvP is something that I find rather frustrating.
I don't mind the sPvP itself, in fact the more I get into it the more I enjoy it - but I do hate the fact that I always have to be wearing a glaring red or blue armor set.
With rewards being cool item skins or dyes to customize your armor, it is rather pointless to have all that taken away when you go into sPvP itself.
The only place you get to see your character the way you want him to be is in the Mists, but once you get into action your customization is removed.
Red names over an enemy are a standard in almost every game, and I think that you really don't need to paint an entire person to know that he's not on your team.
Besides, if I'm not mistaken in WvW you see the enemy team as red while you see yourself and your team in their original colors.
Why not implement that in sPvP?
The only reason that comes to mind is that sPvP is much faster paced and people switch teams often, so...uhm, I guess in order for someone not to get confused whose side he's on this round they put in a constant reminder...in the form of you glowing your team colors all the way.
I don't think this is a...valid reason.
Either way, there has to be a better solution than painting your entire character red/blue.