Put simply this is the game Homeworld 2 SHOULD have been...
Space combat is very rich and compelling, keeping a "realistic" feel to it all. Humans have advanced in technology but their best space drives still means a voyage to jupiter takes 8 months. Your ships also have momentum so that when you issue a command to your ship you can see front mounted thrusters firing to slow your ship down in order to perform a tight turn before bringing your main rear engines to bear before firing in a flash of brilliant light.
Ships can be outfitted with 4 different types of weapons - Laser (for knocking out enemy ships devices), Ballistic (for doing large amounts of general damage to the hull), Energy (overloads an enemy ships shields), and Missile (limited ammunition but LOTS of damage). You also have 2 types of squadrons - Commandos (invade enemy ships or stations) and Fighters (useful for taking out enemy missiles, fighters, or attacking a ships devices).
To fans of space combat I HIGHLY recommend this game.