this is the best RTS game I've played.
My only trouble is the econy, it's very difficult to maintain both energy and mass.
Units are extremely good : some have beams and must fire in a straight line, some are resistant and slow. Each faction has strengths and weaknesses. Maybe the naval units are too similar but it will probably be change in a future patch or expansion.
Graphics are awesome with a 8800gtx(only the sky in low res is crappy).
Excellent game you will appreciate if you're not afraid to learn the subtilities of the gameplay