That dark blue from the campaign is a bit too dark, especially when used as text messages. I prefer to use easily readable colors in skirmish/multi.
Dark Blue? That literal Dark Blue (RGB of 0, 0, 255), or the one the Allies mostly use on the Campaign and Vanilla RA2? That "dark blue" you are referring makes me think of the one darker than the one in Vanilla, and one used by the USA in Generals Campaign.