Aerotech is probably the worst of the major groups. Love the background, love the universe, and the Battletech game is very good, but Battlespace/Aerotech was just poorly designed from the get go.
Hell, I even love the concepts used - recharge sails, jumpships carrying various dropships, fighter heavy, with small numbers of extremely powerful warships.
But the math doesn't work, the game is clumsy, and the ships designs were obviously done by a different group than did the fluff, because they often don't match!
My favorite board games are B5 Wars followed by Star Fleet Battles. Reading through the Saganami Island Tactical Simulator now (the Honor Harrington game).
Favorite computer games - Privateer from the Wing Commander series, and MOO2 as a strategy game. Best overall space game - Star Control 2, a great combination of stragegy, role playing, and arcade shooter.