Americans FTW!
I love to play them. Simple but deadly when played right. I play them since i get CoH few months after release. When you know pros and cons of your army, It's easy to use their advantages to win and don't let enemy use your disadvantages. When you know which unit is best against some type of enemy unit and what building/upgrade/unit is needed most for winning the battle... the game is already won. I really feel this when I'm playing Americans - they are flexible, can accomodate to every situation when I choose right command tree I really can feel that I'm controlling the situation on battlefield.