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To my play experience, maybe the best 3D second world war RTS given to us.
If you seek true strategy, troops which can grab any weapon / ammo or repair tanks when really needed... by that I mean, if your last squad ran out of ammo and had to salvage any weapons they could find on their dead comrades while someone is repairing an enemy tank since the enemy is coming back at you. Then it's for you!
Forget the Company of Heroes (which is super arcadey) and welcome to the beautiful and somewhat realistic Men of War Assault Squad 2 (MoW AS2). From infantry to tanks, you will enjoy lots of diversity and I hope you will be as stunned as I was from watching the level of details of some models.
I think one of the really good points, aside from great strategy and game mechanisms, is the moddability. You will find online great mods to work with that game: from increasing realism (thus difficulty), adding new units... or even transforming your whole game into the dream Star Wars RTS!
A must have :)