My review (short)
Overall, the best RTS I have seen yet. Dispenses with standard hoard-n-horde tactics to focus on a more realistic system, an incredibly complex rock-paper-scissors, where any of the three can duck behind a wall. The cover mechanics and squad system are something I want to see in EVERY RTS, and is what I see as a weakness in all other RTS games. The balance is always a problem, as it is hard to balance something that was imbalanced in real life while maintaining a realistic touch. (I.E., giving Axis the ability to manufacture their expensive and complicated tanks, while making sure you don't get a horde of Shermans coming through the hedges.)
Oh, and did I mention the destructible environment? =)