Heh, my tactic in Homeworld 2 was to rush Battlecruisers. Hard to do in a 1v1, but oh so easy in FFA (then everyone hates you and quits the game). Best match I've had is when a regular I played against, in a 1v1, decided to rush BCs too. We had 3 fights with over 20 BCs and after each fight we would mine the resources from the wreaks as we exhausted every asteroid on the map, by the final fight we had so many ships we crashed the game...
Really hope HW3 turns out good.